Whom is this guide for?

People that are interested in a detailed description about how Blueriq handles XML messages based on XSD schemas

What is in this guide?

This guide lists the behavior of the Runtime when creating or parsing XML messages based on XSD schemas (SOAP and REST with schema sets).

The behavior is broken down by:

whether the message is being sent or being received
whether attributes and relations are inside a sequence or a choice
whether an element is mapped to an attribute or a relation
whether the attribute or relation is single-valued or multi-valued

1. Sending an XML message

1.1 Sequences

When generating XML sequences, the following general rules apply:

a sequence is repeated at least as many times as indicated by the minOccurs on the sequence
a sequence is repeated at most as many times as indicated by the maxOccurs on the sequence
if a sequence cannot be repeated at least minOccurs times, an error is thrown
if it is possible to repeat a sequence more than maxOccurs times, an error is thrown

When generating tags inside sequences mapped to attributes or relations, the following rules determine whether a tag is generated, the form of the tag:

system-set unknowns never generate a tag
user-set unknown attributes generate an empty or nil tag, depending on the nillable property
unknown relations never generate a tag (whether they be user set or system set)
known values always generate tag

When a tag cannot be generated as per the rules above, the following rules determine whether this is an error or not:

if a tag cannot be generated and the tag minOccurs requires at least 1 tag to be generated, an error is thrown

The following rules apply for multi-valued attributes and relations:

when an attribute or relation results in multiple tags (i.e. multi-valued attributes or relations), the number of generated tags must not exceed the maxOccurs on that tag, otherwise an error is thrown.
when an attribute is multi-valued and does not have enough values to satisfy the minOccurs constraint, it is padded with empty or nil elements. Padding applies for attributes, as it doesn't result in extra values on the receiving side.
when a relation is multi-valued and does not have enough values to satisfy the minOccurs constraint, an error is thrown. Padding does not apply for relations, as that results in extra instances on the receiving side.

Note:

if
- a tag is inside a sequence with maxOccurs = n > 1 and
- the tag has maxOccurs = m > 0 and
- the attribute or relation has p > m values
then
- an error is still thrown
- it is not possible to choose m values on the first repetition of the sequence and the remaining p - m values on the second repetition of the sequence
- when a tag mapped to an attribute or relation is expanded, all of its values are considered in one go and must conform to the minOccurs and maxOccurs constraints on that tag

1.1.1 Single-Valued Attributes

Value	Source	minOccurs	nillable	Result
unknown	system	0	*	element not present
unknown	system	> 0	*	error
unknown	user	0	false	empty element
unknown	user	0	true	nil element
unknown	user	1	false	empty element
unknown	user	1	true	nil element
unknown	user	> 1	false	as many empty elements as required by minOccurs
unknown	user	> 1	true	as many nil elements as required by minOccurs
known	*	*	*	an element containing the value

1.1.2 Multi-Valued Attributes

Value	Source	minOccurs	nillable	Result
unknown	system	0	*	no elements present
unknown	system	> 0	*	error
unknown	user	0	false	empty element
unknown	user	0	true	nil element
unknown	user	> 0	false	as many empty elements as required by minOccurs
unknown	user	> 0	true	as many nil elements as required by minOccurs
known, count < minOccurs	*	*	false	count elements with values, padded with empty elements as required by minOccurs
known, count < minOccurs	*	*	true	count elements with values, padded with nil elements as required by minOccurs
known, minOccurs <= count <= maxOccurs	*	*	*	as many elements as there are values, each element containing the corresponding value
known, maxOccurs < count	*	*	*	error

1.1.3 Single-Valued Relations

The source of relations is not used when handing unknown relations. Empty or nil tags are never created for relations, as that would lead to extra, unwanted instances on the receiving side.

Value	minOccurs	nillable	Result
unknown	0	*	element not present
unknown	> 0	*	error
known, attributes and relations do not generate sub-elements	*	false	empty element
known, attributes and relations do not generate sub-elements	*	true	nil element
known, at least one attribute or relation generates a sub-element	*	*	an element with sub-elements according to the rules on this page

1.1.4 Multi-Valued Relations

Value	minOccurs	nillable	Result
unknown	0	*	no elements present
unknown	> 0	*	error
known, count < minOccurs	*	*	error
known, minOccurs <= count <= maxOccurs	*	false	count elements
known, minOccurs <= count <= maxOccurs	*	true	count elements. If any of the instances do not generate sub-elements, the element corresponding to that instance is nil
known, maxOccurs < count	*	*	error

When a multi-valued relation is mapped directly to a sequence, the relation must have exactly as many values as indicated by the minOccurs and maxOccurs on the sequence. If there are too few values or too many, an error is thrown.

1.2 Choices

The behaviour of choices depends on the min/maxOccurs on the choice, the min/maxOccurs of the elements inside the choice, as well as the value and source of the attributes or relations mapped to those elements.

It is possible to choose multiple times, as required by minOccurs and restricted by maxOccurs on the choice. When choosing a second time, the same element that was chosen on the first choice cannot be chosen again, unless it has minOccurs = 0.

The following rules apply when generating an XML choice:

at last as many choices are made as indicated by the minOccurs on the choice
at most as many choices are made as indicated by the maxOccurs on the choice
once an element has been chosen, it cannot be chosen again, unless it has minOccurs = 0
if a choice must be made and it's not possible to choose anything, an error is thrown
if the maximum number of choices has been made and there are other elements that could be chosen, an error is thrown

The following rules determine whether an element mapped to an attribute or relation is chosen:

system-set unknown is never chosen
user-set unknown attributes are chosen and generate an empty or nil tag, depending on the nillable property
unknown relations are never chosen (regardless of whether they are user set or system set)
known values are always chosen
if an element has already been chosen, it cannot be chosen again unless it has minOccurs = 0 and the attribute is system-set unknown or the relation is unknown (system or uset set)
- this rule effectively means that if there aren't enough values to fill a choice with minOccurs > 1 and there are elements with minOccurs = 0 that map to unknowns which do not generate elements (i.e. system-set unknown for attributes, all unknowns for relations), then we consider that we've chosen these elements "zero" times instead of throwing an error

The following rules apply for multi-valued attributes and relations:

when an attribute or relation results in multiple tags (i.e. multi-valued attributes or relations), the number of generated tags must not exceed the maxOccurs on that tag, otherwise an error is thrown.
when an attribute is multi-valued and does not have enough values to satisfy the minOccurs constraint, it is padded with empty or nil elements. Padding applies for attributes, as it doesn't result in extra values on the receiving side.
when a relation is multi-valued and does not have enough values to satisfy the minOccurs constraint, an error is thrown. Padding does not apply for relations, as that results in extra instances on the receiving side.

1.2.1 Single-Valued Attributes

The following table illustrates the Runtime behaviour assuming there is a choice in the XSD which has two elements inside it: element A and element B. The table headings have the following meaning:

Choice min = the value of minOccurs on the choice itself
Element A/B Value = the value of the attribute mapped to element A/B
Element A/B Source = the source of the value of the attribute mapped to element A/B (system indicates the value was derived by the Rule Engine, user indicates the value was set manually via user interaction, service call, etc)
Element A/B min = the value of minOccurs on element A/B in the XSD
Element A/B nill = the value of the nillable attribute on element A/B in the XSD

Choice min	Element A				Element B				Result	Explanation
Choice min	Value	Source	min	nill	Value	Source	min	nill	Result	Explanation
0	unknown	system	*	*	unknown	system	*	*	no element is present	chosen 0 times, or chosen element A 0 times, or chosen element B 0 times
0	unknown	system	*	*	unknown	user	0	false	<B/>	chosen element B 1 time
0	unknown	system	*	*	unknown	user	0	true	<B xsi:nil="true"/>	chosen element B 1 time
0	unknown	system	*	*	unknown	user	1	false	<B/>	chosen element B 1 time
0	unknown	system	*	*	unknown	user	1	true	<B xsi:nil="true"/>	chosen element B 1 time
0	unknown	system	*	*	unknown	user	> 1	false	<B /> <B/>	chosen as many empty B elements as required by element B minOccurs, chosen 1 time
0	unknown	system	*	*	unknown	user	> 1	true	<B xsi:nil="true"/> <B xsi:nil="true"/>	chosen as many nil B elements as required by element B minOccurs, chosen 1 time
0	unknown	system	*	*	known	<= 1	*	*	<B>value</B>
0	unknown	system	*	*	known	> 1	*	false	<B>value</B> <B/>	chosen 1 B element and padded with as many empty elements as required by minOccurs of element B, chosen 1 time
0	unknown	system	*	*	known	> 1	*	true	<B>value</B> <B xsi:nil="true"/>	chosen 1 B element and padded with as many nil elements as required by minOccurs of element B, chosen 1 time
0	unknown	user	0	false	unknown	system	*	*	<A>	chosen element A 1 time
0	unknown	user	0	true	unknown	system	*	*	<A xsi:nil="true"/>	chosen element A 1 time
0	unknown	user	1	false	unknown	system	*	*	<A>	chosen element A 1 time
0	unknown	user	1	true	unknown	system	*	*	<A xsi:nil="true"/>	chosen element A 1 time
0	unknown	user	> 1	false	unknown	system	*	*	<A>value</A> <A/>	chosen 1 A element and padded with as many empty elements as required by minOccurs of element A, chosen 1 time
0	unknown	user	> 1	true	unknown	system	*	*	<A>value</A> <A xsi:nil="true"/>	chosen 1 A element and padded with as many nil elements as required by minOccurs of element A, chosen 1 time
0	unknown	user	*	*	unknown	user	*	*	error
0	unknown	user	*	*	known	*	*	*	error
0	known	*	*	*	unknown	system	*	*	<A>value</A>	chosen 1 A element 1 time
0	known	*	*	*	unknown	user	*	*	error
0	known	*	*	*	known	*	*	*	error
1	unknown	system	0	*	unknown	system	0	*	no element is present	chosen element A 0 times, or chosen element B 0 times
1	unknown	system	0	*	unknown	system	> 0	*	no element is present	chosen element A 0 times
1	unknown	system	0	*	unknown	user	<= 1	false	<B />	chosen element B 1 time
1	unknown	system	0	*	unknown	user	<= 1	true	<B xsi:nil="true"/>	chosen element B 1 time
1	unknown	system	0	*	unknown	user	> 1	false	<B/> <B/>	chosen element B 1 time, padded with as many empty elements as required by minOccurs of element B
1	unknown	system	0	*	unknown	user	> 1	true	<B xsi:nil="true" /> <B xsi:nil="true" />	chosen element B 1 time, padded with as many nil elements as required by minOccurs of element B
1	unknown	system	0	*	known	*	<= 1	*	<B>value</B>	chosen element B 1 time
1	unknown	system	0	*	known	*	> 1	false	<B>value</B> <B />	chosen element B 1 time, padded with as many empty elements as required by minOccurs of element B
1	unknown	system	0	*	known	*	> 1	true	<B>value</B> <B xsi:nil="true" />	chosen element B 1 time, padded with as many nil element as required by minOccurs of element B
1	unknown	system	> 0	*	unknown	system	0	*	no element is present	chosen element B 0 times
1	unknown	system	> 0	*	unknown	system	> 0	*	error	no element could be chosen
1	unknown	system	> 0	*	unknown	user	<= 1	false	<B/>	chosen element B 1 time
1	unknown	system	> 0	*	unknown	user	<= 1	true	<B xsi:nil="true"/>	chosen element B 1 time
1	unknown	system	> 0	*	unknown	user	> 1	false	<B /> <B />	chosen element B 1 time, padded with as many empty elements as required by minOccurs of element B
1	unknown	system	> 0	*	unknown	user	> 1	true	<B xsi:nil="true" /> <B xsi:nil="true" />	chosen element B 1 time, padded with as many empty elements as required by minOccurs of element B
1	unknown	system	> 0	*	known	*	<= 1	*	<B>value</B>	chosen element B 1 time
1	unknown	system	> 0	*	known	*	> 1	false	<B>value<B> <B />	chosen element B 1 time, padded with as many empty elements as required by minOccurs of element B
1	unknown	system	> 0	*	known	*	> 1	true	<B>value</B> <B xsi:nil="true"/>	chosen element B 1 time, padded with as many nil elements as required by minOccurs of element B
1	unknown	user	<= 1	false	unknown	system	*	*	<A/>	chosen element A 1 time
1	unknown	user	<= 1	true	unknown	system	*	*	<A xsi:nil="true" />	chosen element A 1 time
1	unknown	user	> 1	false	unknown	system	*	*	<A/> <A/>	chosen element A 1 time, padded with as many empty elements as required by minOccurs of element A
1	unknown	user	> 1	true	unknown	system	*	*	<A xsi:nil="true" /> <A xsi:nil="true" />	chosen element A 1 time, padded with as many nil elements as required by minOccurs of element A
1	unknown	user	*	*	unknown	user	*	*	error
1	unknown	user	*	*	known	*	*	*	error
1	known	*	<= 1	*	unknown	system	*	*	<A>value</A>
1	known	*	> 1	false	unknown	system	*	*	<A>value</A> <A/>	chosen element A 1 time, padded with as many empty elements as required by minOccurs of element A
1	known	*	> 1	true	unknown	system	*	*	<A>value</A> <A xsi:nil="true" />	chosen element A 1 time, padded with as many nil elements as required by minOccurs of element A
1	known	*	*	*	unknown	user	*	*	error
1	known	*	*	*	known	*	*	*	error
> 1	unknown	system	0	*	unknown	system	0	*	no element present	Chosen as many times as required by minOccurs of choice. At each choice, either element A was chosen 0 times, or element B was chosen 0 times
> 1	unknown	system	0	*	unknown	system	> 1	*	no element present	Chosen as many times as required by minOccurs of choice. At each choice, element A was chosen 0 times
> 1	unknown	system	0	*	unknown	user	<= 1	*	<B>	Chosen as many times as required by minOccurs of choice. On the first choice, element B was chosen 1 time. On the remaining choices, element A was chosen 0 times.
> 1	unknown	system	0	*	unknown	user	> 1	false	<B> <B>	Chosen as many times as required by minOccurs of choice. On the first choice, element B was chosen as many times as required by minOccurs of element B. On the remaining choices, element A was chosen 0 times
> 1	unknown	system	0	*	unknown	user	> 1	true	<B xsi:nil="true" /> <B xsi:nil="true" />	Chosen as many times as required by minOccurs of choice. On the first choice, element B was chosen as many times as required by minOccurs of element B. On the remaining choices, element A was chosen 0 times
> 1	unknown	system	0	*	known	*	<= 1	*	<B>value</B>	Chosen as many times as required by minOccurs of choice. On the first choice, element B was chosen. On the remaining choices, element A was chosen 0 times
> 1	unknown	system	0	*	known	*	> 1	false	<B>value</B> <B/>	Chosen as many times as required by minOccurs of choice. On the first choice, element B was chosen, padded with as many empty elements as required by minOccurs of element B On the remaining choices, element A was chosen 0 times
> 1	unknown	system	0	*	known	*	> 1	true	<B>value</B> <B xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice. On the first choice, element B was chosen, padded with as many nill elements as required by minOccurs of element B On the remaining choices, element A was chosen 0 times
> 1	unknown	system	> 0	*	unknown	system	0	*	no element present	Chosen as many times as required by minOccurs of choice. On each choice, element B was chosen 0 times
> 1	unknown	system	> 0	*	unknown	system	> 0	*	error	no element could be chosen
> 1	unknown	system	> 0	*	unknown	user	0	false	<B>	Chosen as many times as required by minOccurs of choice On the first choice, element B was chosen 1 time On the remaining choices, element B was chosen 0 times
> 1	unknown	system	> 0	*	unknown	user	0	true	<B xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element B was chosen 1 time. On the remaining choices, element B was chosen 0 times.
> 1	unknown	system	> 0	*	unknown	user	> 0	*	error	Chosen as many times as required by minOccurs of choice On the first choice, element B was chosen as many times as required by minOccurs of element B On the remaining choices, no other element could be chosen
> 1	unknown	system	> 0	*	known	*	0	*	<B>value</B>	Chosen as many times as required by minOccurs of choice. On the first choice, element B was chosen 1 time. On the remaining choices, element B was chosen 0 times
> 1	unknown	system	> 0	*	known	*	> 0	*	error	Chosen as many times as required by minOccurs of choice On the first choice, element B was chosen as many times as required by minOccurs of element B On the remaining choices, no other element could be chosen
> 1	unknown	user	0	false	unknown	system	0	*	<A>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	false	unknown	system	> 0	*	<A>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the remaining choices, element A was chosen 0 times
> 1	unknown	user	0	false	unknown	user	<= 1	false	<A> <B>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen 1 time On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	false	unknown	user	<= 1	true	<A> <B xsi:nil="true" />	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen 1 time On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	false	unknown	user	> 1	false	<A> <B> <B>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen as many times as required by minOccurs of element B On the remaining choices, element A was chosen 0 times
> 1	unknown	user	0	false	unknown	user	> 1	true	<A> <B xsi:nil="true"/> <B xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen as many times as required by minOccurs of element B On the remaining choices, element A was chosen 0 times
> 1	unknown	user	0	false	known	*	<= 1	*	<A> <B>value</A>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen as many times as required by minOccurs of element B On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	false	known	*	> 1	false	<A> <B>value</B> <B/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen, padded with empty elements as required by minOccurs of element B On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	false	known	*	> 1	true	<A> <B>value</B> <B xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen, padded with nil elements as required by minOccurs of element B On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	true	unknown	system	0	*	<A xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	true	unknown	system	> 0	*	<A xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the remaining choices, element A was chosen 0 times
> 1	unknown	user	0	true	unknown	user	<= 1	false	<A xsi:nil="true"> <B>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen 1 time On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	true	unknown	user	<= 1	true	<A xsi:nil="true"/> <B xsi:nil="true" />	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen 1 time On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	true	unknown	user	> 1	false	<A xsi:nil="true"/> <B> <B>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen as many times as required by minOccurs of element B On the remaining choices, element A was chosen 0 times
> 1	unknown	user	0	true	unknown	user	> 1	true	<A xsi:nil="true"/> <B xsi:nil="true"/> <B xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen as many times as required by minOccurs of element B On the remaining choices, element A was chosen 0 times
> 1	unknown	user	0	true	known	*	<= 1	*	<A xsi:nil="true"/> <B>value</A>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen as many times as required by minOccurs of element B On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	true	known	*	> 1	false	<A xsi:nil="true"/> <B>value</B> <B/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen, padded with empty elements as required by minOccurs of element B On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	0	true	known	*	> 1	true	<A xsi:nil="true"/> <B>value</B> <B xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice element B was chosen, padded with nil elements as required by minOccurs of element B On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	unknown	user	> 0	false	unknown	system	0	*	<A/> <A/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the remaining choices, element B was chosen 0 times
> 1	unknown	user	> 0	false	unknown	system	> 0	*	error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen as many times as required by minOccurs of element A On the remaining choices, no other element could be chosen
> 1	unknown	user	> 0	false	unknown	user	0	*	<A/> <A/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the remaining choices, element B was chosen 0 times
> 1	unknown	user	> 0	false	unknown	user	> 0	false	<A/> <A/> <B/> <B/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen, padded with empty elements as required by minOccurs of element B If choice minOccurs > 2, then it is an error, as there is no 3rd element that could be chosen
> 1	unknown	user	> 0	false	unknown	user	> 0	true	<A/> <A/> <B xsi:nil="true"/> <B xsi:nil="true"/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen, padded with nil elements as required by minOccurs of element B If choice minOccurs > 2, then it is an error, as there is no 3rd element that could be chosen
> 1	unknown	user	> 0	false	known	*	0	*	<A/> <A/> <B>value</B>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen 1 time On the remaining choices, element B was chosen 0 times
> 1	unknown	user	> 0	false	known	*	> 0	false	<A/> <A/> <B>value</B> <B/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen, padded with empty elements as required by minOccurs of element B If choice minOccurs > 2, then it is an error, as there is no 3rd element that could be chosen
> 1	unknown	user	> 0	false	known	*	> 0	true	<A/> <A/> <B>value</B> <B xsi:nil="true"/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen, padded with nil elements as required by minOccurs of element B If choice minOccurs > 2, then it is an error, as there is no 3rd element that could be chosen
> 1	known	*	0	*	unknown	system	0	*	<A>value</A>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	known	*	0	*	unknown	system	> 0	*	<A>value</A>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the remaining choices, element A was chosen 0 times
> 1	known	*	0	*	known	*	0	*	<A>value</A> <B>value</A>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice, element B was chosen 1 time On the remaining choices, element A was chosen 0 times or element B was chosen 0 times
> 1	known	*	0	*	known	*	> 0	false	<A>value</A> <B>value</B> <B/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice, element B was chosen, padded with empty elements as required by minOccurs of element B On the remaining choices, element A was chosen 0 times
> 1	known	*	0	*	known	*	> 0	true	<A>value</A> <B>value</B> <B xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen 1 time On the second choice, element B was chosen, padded with nil elements as required by minOccurs of element B On the remaining choices, element A was chosen 0 times
> 1	known	*	> 0	false	unknown	system	0	*	<A>value</A> <A/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty element as required by minOccurs of element A On the remaining choices, element B was chosen 0 times
> 1	known	*	> 0	false	unknown	system	> 0	*	error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty element as required by minOccurs of element A On the remaining choices, no other element could be chosen
> 1	known	*	> 0	false	unknown	user	0	false	<A>value</A> <A/> <B/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen 1 time On the remaining choices, element B was chosen 0 times
> 1	known	*	> 0	false	unknown	user	0	true	<A>value</A> <A/> <B xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen 1 time On the remaining choices, element B was chosen 0 times
> 1	known	*	> 0	false	unknown	user	> 0	false	<A>value</A> <A/> <B/> <B/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen, padded with empty elements as required by minOccurs of element B If choice minOccurs > 2, then error as no 3rd element could be chosen
> 1	known	*	> 0	false	unknown	user	> 0	true	<A>value</A> <A/> <B xsi:nil="true"/> <B xsi:nil="true"/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen, padded with nil elements as required by minOccurs of element B If choice minOccurs > 2, then error as no 3rd element could be chosen
> 1	known	*	> 0	false	known	*	0	*	<A>value</A> <A/> <B>value</B>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen 1 time On the remaining choices, element B was chosen 0 times
> 1	known	*	> 0	false	known	*	> 0	false	<A>value</A> <A/> <B>value</B> <B/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen, padded with empty elements as required by minOccurs of element B If choice minOccurs > 2, then error as no 3rd element could be chosen
> 1	known	*	> 0	false	known	*	> 0	true	<A>value</A> <A/> <B>value</B> <B xsi:nil="true"/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with empty elements as required by minOccurs of element A On the second choice, element B was chosen, padded with nil elements as required by minOccurs of element B If choice minOccurs > 2, then error as no 3rd element could be chosen
> 1	known	*	> 0	true	unknown	system	0	*	<A>value</A> <A xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with nil elements as required by minOccurs of element A On the remaining choices, element B was chosen 0 times
> 1	known	*	> 0	true	unknown	system	> 0	*	error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with nil elements as required by minOccurs of element A On the remaining choices, no other element could be chosen
> 1	known	*	> 0	true	unknown	user	0	false	<A>value</A> <A xsi:nil="true"/> <B/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with nil elements as required by minOccurs of element A On the second choice, element B was chosen 1 time On the remaining choices, element B was chosen 0 times
> 1	known	*	> 0	true	unknown	user	0	true	<A>value</A> <A xsi:nil="true"/> <B xsi:nil="true"/>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with nil elements as required by minOccurs of element A On the second choice, element B was chosen 1 time On the remaining choices, element B was chosen 0 times
> 1	known	*	> 0	true	unknown	user	> 0	false	<A>value</A> <A xsi:nil="true"/> <B/> <B/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with nil elements as required by minOccurs of element A On the second choice, element B was chosen, padded with empty elements as required by minOccurs of element B If choice minOccurs > 2, then error as no 3rd element could be chosen
> 1	known	*	> 0	true	unknown	user	> 0	true	<A>value</A> <A xsi:nil="true"/> <B xsi:nil="true"/> <B xsi:nil="true"/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with nil elements as required by minOccurs of element A On the second choice, element B was chosen, padded with nil elements as required by minOccurs of element B If choice minOccurs > 2, then error as no 3rd element could be chosen
> 1	known	*	> 0	true	known	*	0	*	<A>value</A> <A xsi:nil="true"/> <B>value</B>	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with nil elements as required by minOccurs of element A On the second choice, element B was chosen 1 time On the remaining choices, element B was chosen 0 times
> 1	known	*	> 0	true	known	*	> 0	false	<A>value</A> <A xsi:nil="true"/> <B>value</B> <B/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with nil elements as required by minOccurs of element A On the second choice, element B was chosen, padded with empty elements as required by minOccurs of element B If choice minOccurs > 2, then error as no 3rd element could be chosen
> 1	known	*	> 0	true	known	*	> 0	true	<A>value</A> <A xsi:nil="true"/> <B>value</B> <B xsi:nil="true"/> or error	Chosen as many times as required by minOccurs of choice On the first choice, element A was chosen, padded with nil elements as required by minOccurs of element A On the second choice, element B was chosen, padded with nil elements as required by minOccurs of element B If choice minOccurs > 2, then error as no 3rd element could be chosen

1.2.2 Multi-Valued Attributes

The same general rules apply for multi-valued attributes as for single-valued attributes. In addition, there can be situations where the attribute is known and the value count is :

too low to satisfy the minOccurs requirement
too high to satisfy the maxOccurs requirement

The following table summarizes the Runtime behaviour for a multi-valued attribute with a known value.

Value Count	nillable	Result	Explanation
count < minOccurs	false	<A>value 1</A> <A>value 2</A> <A/>	count elements with values, padded with empty elements as required by minOccurs
count < minOccurs	true	<A>value 1</A> <A>value 2</A> <A xsi:nil="true"/>	count elements with values, padded with nil elements as required by minOccurs
minOccurs <= count <= maxOccurs	*	<A>value 1</A> <A>value 2</A>	as many elements as there are values, each element containing the corresponding value
maxOccurs < count	*	error	When a choice is made and the multi-valued attribute is chosen, all values of that attribute are chosen and must satisfy the maxOccurs requirement. If the choice has maxOccurs > 1, it is not possible to choose some of the values of the attribute on the first choice and the remaining values in another choice.

1.2.3 Single-Valued Relations

Unknown relations are never chosen, as that would result in extra instances created on the receiving side.

Padding with empty or nil tags to satisfy minOccurs requirements does not apply, as that also would result in extra instances created on the receiving side.

Choice minOccurs	Choice maxOccurs	Element A		Element B		Result	Explanation
Choice minOccurs	Choice maxOccurs	Value	minOccurs	Value	minOccurs	Result	Explanation
0	*	unknown	*	unknown	*	no element present	chosen 0 times
0	*	unknown	*	known	<= 1	<B> ... </B>	chosen element B 1 time
0	*	unknown	*	known	> 1	error	chosen element B 1 time, but could not satisfy minOccurs requirement of element B
0	*	known	<= 1	unknown	*	<A>...</A>	chosen element A 1 time
0	<= 1	known	<= 1	known	<= 1	error	chosen element A 1 time and element B 1 time, but choice maxOccurs does not allow making 2 choices
0	> 1	known	<= 1	known	<= 1	<A>...</A> <B>...</B>	chosen element A 1 time and element B 1 time
0	*	known	<= 1	known	> 1	error	chosen element A 1 time and element B 1 time, but could not satisfy minOccurs requirement of element B
0	*	known	> 1	*	*	error	chosen element A 1 time, but could not satisfy minOccurs requirement of element A
1	*	unknown	0	unknown	0	no element present	chosen element A 0 times or chosen element B 0 times
1	*	unknown	0	unknown	> 0	no element present	chosen element A 0 times
1	*	unknown	0	known	<= 1	<B>...</B>	chosen element B 1 time
1	*	unknown	0	known	> 1	error	chosen element B 1 time, but could not satisfy minOccurs requirement of element B
1	*	unknown	> 0	unknown	0	no element present	chosen element B 0 times
1	*	unknown	> 0	unknown	> 0	error	no element could be chosen
1	*	unknown	> 0	known	<= 1	<B>...</B>	chosen element B 1 time
1	*	unknown	> 0	known	> 1	error	chosen element B 1 time, but could not satisfy minOccurs requirement of element B
1	*	known	<= 1	unknown	*	<A>...</A>	chosen element A 1 time
1	<= 1	known	<= 1	known	<= 1	error	chosen element A 1 time and element B 1 time, but choice maxOccurs does not allow making 2 choices
1	> 1	known	<= 1	known	<= 1	<A>...</A> <B>...</B>	chosen element A 1 time and element B 1 time
1	*	known	<= 1	known	> 1	error	chosen element A 1 time and element B 1 time, but could not satisfy minOccurs requirement of element B
1	*	known	> 1	*	*	error	chosen element A 1 time, but could not satisfy minOccurs requirement of element A
2	*	unknown	0	unknown	0	no element present	chosen element A 0 times and element B 0 times
2	*	unknown	0	unknown	> 0	error	chosen element A 0 times on the first choice, but no other element could be chosen on the second choice
2	*	unknown	0	known	<= 1	<B>...</B>	chosen element A 0 times and element B 1 time
2	*	unknown	0	known	> 1	error	chosen element A 0 times and element B 1 time, but could not satisfy minOccurs requirement of element B
2	*	unknown	> 0	unknown	0	error	chosen element B 0 times on the first choice, but no other element could be chosen on the second choice
2	*	unknown	> 0	unknown	> 0	error	no element could be chosen
2	*	unknown	> 0	known	<= 1	error	chosen element B 1 times on the first choice, but no other element could be chosen on the second choice
2	*	unknown	> 0	known	> 1	error	chosen element B 1 times on the first choice, but could not satisfy minOccurs requirement of element B
2	*	known	<= 1	unknown	0	<A>...</A>	chosen element A 1 times on the first choice, and chosen element B 0 times on the second choice
2	*	known	<= 1	unknown	> 0	error	chosen element A 1 times on the first choice, but no other element could be chosen on the second choice
2	*	known	<= 1	known	<= 1	<A>...</A> <B>...</B>	chosen element A 1 times on the first choice, and chosen element B 1 times on the second choice
2	*	known	<= 1	known	> 1	error	chosen element A 1 times on the first choice and chosen element B 1 times on the second choice, but could not satisfy minOccurs requirement of element B
2	*	known	> 1	*	*	error	chosen element A 1 times on the first choice, but could not satisfy minOccurs requirement of element A
> 2	*	*	*	*	*	error	There must be at least as many elements in the choice as the choice minOccurs. The number of elements that can be chosen must not exceed choice maxOccurs.

The <A>...</A> results in the table above can be further described as depending on:

whether element A is nillable or not
whether any of the attributes or relations of the instance mapped to element A generate sub-elements

#	Nillable	Sub-Elements	Result	Explanation
1	false	false	<A/>
2	false	true	<A> <Sub>...</Sub> <A>	The way in which the sub-elements are expanded depends on whether they are in a sequence or a choice whether they are mapped to attributes or relations the minOccurs, maxOccurs, nillable properties of the sub-elements All the rules described on this page apply recursively to sub-elements.
3	true	false	<A xsi:nil="true"/>	Instead of expanding empty or nil sub-elements, the message is made smaller by setting the A element to nil. Note that if in the XSD there are sub-elements which have minOccurs > 0 then no error is thrown, as xsi:nil="true" overrides those requirements, as described in the XSD Specification
4	true	true	<A> <Sub>...</Sub> </A>	The explanation for #2 applies for #4 as well.

1.2.4 Multi-Valued Relations

The same rules apply for mulit-valued relations within a choice as for single-valued relations within a choice, as described in chapter 1.2.3. In addition, there can be situations where multi-valued relations:

do not have enough values to satisfy the minOccurs requirement of the element
have too many values to satisfy the maxOccurs requirement of the element

The behaviour of multi-valued relations in choices is similar to that of multi-valued attributes in choices (described in chapter 1.2.2), except that no padding with empty or nil tags is done in order to automatically satisfy the minOccurs requirement. In contrast with multi-valued attributes in choices, for multi-valued relations in choices an error will occur if the relation doesn't have enough values.

The following table summarizes the Runtime behaviour for a multi-valued relations with a known value.

Value Count

Result

Explanation

count < minOccurs

error

cannot satisfy the minOccurs requirement and no padding with empty or nill elements can be done

minOccurs <= count <= maxOccurs

as many elements as there are values, each element containing the corresponding value

maxOccurs < count

error

When a choice is made and the multi-valued relation is chosen, all values of that relation are chosen and must satisfy the maxOccurs requirement.

If the choice has maxOccurs > 1, it is not possible to choose some of the values of the relation on the first choice and the remaining values in another choice.

When a multi-valued relation is mapped directly to a choice, the relation must have exactly as many values as indicated by the minOccurs and maxOccurs on the choice. If there are too few values or too many, an error is thrown.

2. Receiving an XML message

2.1 Sequences

When receiving XML sequences, they must conform to the XSD in regards of what elements are possible, the number of each element as constrained by minOccurs and maxOccurs on those elements and whether they are nillable.

A sequence is repeated at least as many times as indicated by the minOccurs on the sequence. If it is not possible to repeat the sequence the required number of times, an error is thrown.

A sequence is repeated at most as many times as indicated by the maxOccurs on the sequence. If it's possible to repeat the sequence more than maxOccurs times, an error is thrown.

The following rules apply for empty or nil tags:

for attributes, an empty or nil tag results in a user-set unknown value
for relations, an empty or nil tag results in an instance which set as the relation value
- all attributes and relations of this instance are system-set unknown
for relations, an empty tag may result in error, depending on the constraints of the sub-elements of that relation
for relations, a nil tag will never result in an error, regardless of the constraints of the sub-elements (these are ignored)

2.1.1 Single-Valued Attributes

XML Element			XSD		Result (Profile)		Explanation
present	nil	empty	minOccurs	nillable	Value	Source	Explanation
false	N/A	N/A	0	*	unknown	system
false	N/A	N/A	> 0	*	error		XML not conform the XSD due to minOccurs
true	false	false	<=1	*	known	user
true	false	false	> 1	*	error		XML not conform the XSD due to minOccurs
true	false	true	<=1	*	unknown	user
true	false	true	> 1	*	error		XML not conform the XSD due to minOccurs
true	true	false	0	false	error		XML not conform the XSD, element cannot have xsi:nil because element is not nillable
true	true	false	0	true	unknown	user	The content is ignored.
true	true	false	1	false	error		XML not conform the XSD, element cannot have xsi:nil because element is not nillable
true	true	false	1	true	unknown	user	The content is ignored
true	true	false	> 1	false	error		XML not conform the XSD, element cannot have xsi:nil because element is not nillable
true	true	false	> 1	true	error		XML not conform the XSD due to minOccurs
true	true	true	0	false	error		XML not conform the XSD, element cannot have xsi:nil because element is not nillable
true	true	true	0	true	unknown	user
true	true	true	1	false	error		XML not conform the XSD, element cannot have xsi:nil because element is not nillable
true	true	true	1	true	unknown	user
true	true	true	> 1	false	error		XML not conform the XSD, element cannot have xsi:nil because element is not nillable
true	true	true	> 1	true	error		XML not conform the XSD due to minOccurs

Note:

when an element is mapped to a single-valued attribute and has minOccurs > 1 in the XSD and the element is present multiple times in the XML, the attribute will have the value of the last element from top to bottom (the value of each element is mapped in turn, later values overwrite prior values)

2.1.2 Multi-Valued Attributes

The same rules apply to multi-valued attributes in a sequence as for single-valued attributes in a sequences (chapter 2.1.1). In addition, there can be situations where the number of XML elements is too high to satisfy the maxOccurs requirements. In this situation an error occurs.

2.1.3 Single-Valued Relations

XML Element		XSD		Result (Profile)		Explanation
present	nil	minOccurs	nillable	Value	Source	Explanation
false	N/A	0	*	unknown	system
false	N/A	> 0	*	error		XML not conform the XSD
true	false	<= 1	*	known	user
true	false	> 1	*	error		XML not conform the XSD
true	true	<= 1	false	error		XML not conform the XSD, element cannot have xsi:nil because element is not nillable
true	true	<= 1	true	unknown	user
true	true	> 1	false	error		XML not conform the XSD, element cannot have xsi:nil because element is not nillable
true	true	> 1	true	error		XML not conform the XSD

2.1.4 Multi-Valued Relations

The same rules apply for mulit-valued relations in a sequence as for single-valued relations in a sequence (chapter 2.1.3). In addition, there can be situations where the number of XML elements exceeds the maxOccurs value from the XSD. In this situation an error occurs.

When a multi-valued relation is mapped directly to a sequence, at least as many repetitions of the sequence must be present as indicated by the minOccurs and maxOccurs on the sequence. If there are too few or too many elements, an error is thrown.

2.2 Choices

When receiving XML choices, the following rules apply:

the choice is repeated at last as many times as indicated by the minOccurs on the choice
the choise is repeated at most as many times as indicated by the maxOccurs on the choice
on each repetition of the choice one element is chosen (see below the rules which determine whether an element is chosen)
if not enough elements could be chosen as required by the minOccurs on the choice, an error is thrown
if too many elements could be chosen as required by the maxOccurs on the choice, an error is thrown

The following rules apply when choosing an element (as defined in the XSD, not in the received XML):

an element can be chosen a single time; if the choice repeates due to minOccurs on the choice, the same element cannot be chosen again
if an element has minOccurs > 0 and there are no other choices that could be made, an error is thrown
empty or nil tags mapped to attributes result in user-set unknown values
empty or nil tags mapped to relations result in an instance which is set in the relation
- all attributes and relations of this instance are system-set unknown
- when the tag is empty, an error could be thrown, depending on the constraints on the sub-elements (rules on this page applied recursively to sub-elements)
- when the tag is nil, an error is never thrown; constraints on sub-elements are ignored

2.2.1 Single-Valued Attributes

Ch. min	Ch. max	Element A					Element B					Result (Profile)
		XML			XSD		XML			XSD		Attribute A		Attribute B
		present	nil	empty	min	nill	present	nil	empty	min	nill	Value	Source	Value	Source
0	*	false	N/A	N/A	0	*	false	N/A	N/A	*	*	unknown	system	unknown	system
>0	*	false	N/A	N/A	0	*	false	N/A	N/A	*	*	error
<=1	*	false	N/A	N/A	0	*	true	false	false	<=1	*	unknown	system	known	user
<=1	*	false	N/A	N/A	0	*	true	false	false	>1	*	error
<=1	*	false	N/A	N/A	0	*	true	false	true	<=1	*	unknown	system	unknown	user
<=1	*	false	N/A	N/A	0	*	true	false	true	>1	*	error
<=1	*	false	N/A	N/A	0	*	true	true	false	<=1	false	error
<=1	*	false	N/A	N/A	0	*	true	true	false	<=1	true	unknown	system	unknown	user
<=1	*	false	N/A	N/A	0	*	true	true	false	>1	*	error
<=1	*	false	N/A	N/A	0	*	true	true	true	<=1	false	error
<=1	*	false	N/A	N/A	0	*	true	true	true	<=1	true	unknown	system	unknown	user
<=1	*	false	N/A	N/A	0	*	true	true	true	>1	*	error
<=1	*	false	N/A	N/A	>0	*	false	N/A	N/A	*	*	unknown	system	unknown	system
<=1	*	false	N/A	N/A	>0	*	true	false	false	<=1	*	unknown	system	known	user
<=1	*	false	N/A	N/A	>0	*	true	false	false	>1	*	error
<=1	*	false	N/A	N/A	>0	*	true	false	true	<=1	*	unknown	system	unknown	user
<=1	*	false	N/A	N/A	>0	*	true	false	true	>1	*	error
<=1	*	false	N/A	N/A	>0	*	true	true	false	<=1	false	error
<=1	*	false	N/A	N/A	>0	*	true	true	false	<=1	true	unknown	system	unknown	user
<=1	*	false	N/A	N/A	>0	*	true	true	false	>1	*	error
<=1	*	false	N/A	N/A	>0	*	true	true	true	<=1	false	error
<=1	*	false	N/A	N/A	>0	*	true	true	true	<=1	true	unknown	system	unknown	user
<=1	*	false	N/A	N/A	>0	*	true	true	true	>1	false	error
<=1	*	false	N/A	N/A	>0	*	true	true	true	>1	true	error
<=1	*	true	false	false	<=1	*	false	N/A	N/A	*	*	known	user	unknown	system
<=1	<=1	true	*	*	*	*	true	*	*	*	*	error
<=1	>1	true	false	false	<=1	*	true	false	false	<=1	*	known	user	known	user
<=1	>1	true	false	false	<=1	*	true	false	false	>1	*	error
<=1	>1	true	false	false	<=1	*	true	false	true	<=1	*	known	user	unknown	user
<=1	>1	true	false	false	<=1	*	true	false	true	>1	*	error
<=1	>1	true	false	false	<=1	*	true	true	false	<=1	false	error
<=1	>1	true	false	false	<=1	*	true	true	false	<=1	true	known	user	unknown	user
<=1	>1	true	false	false	<=1	*	true	true	false	>1	*	error
<=1	> 1	true	false	false	<=1	*	true	true	true	<=1	false	error
<=1	> 1	true	false	false	<=1	*	true	true	true	<=1	true	known	user	unknown	user
<=1	> 1	true	false	false	<=1	*	true	true	true	>1	*	error
<=1	*	true	false	false	>1	*	*	*	*	*	*	error
<=1	*	true	false	true	<=1	*	false	N/A	N/A	*	*	unknown	user	unknown	system
<=1	<=1	true	false	true	<=1	*	true	*	*	*	*	error
<=1	>1	true	false	true	<=1	*	true	false	false	<=1	*	unknown	user	known	user
<=1	>1	true	false	true	<=1	*	true	false	false	>1	*	error
<=1	>1	true	false	true	<=1	*	true	false	true	<=1	*	unknown	user	unknown	user
<=1	>1	true	false	true	<=1	*	true	false	true	>1	*	error
<=1	>1	true	false	true	<=1	*	true	true	false	<=1	false	unknown	user	unknown	user
<=1	>1	true	false	true	<=1	*	true	true	false	<=1	true	unknown	user	unknown	user
<=1	>1	true	false	true	<=1	*	true	true	false	>1	*	error
<=1	>1	true	false	true	<=1	*	true	true	true	<=1	false	error
<=1	>1	true	false	true	<=1	*	true	true	true	<=1	true	unknown	user	unknown	user
<=1	>1	true	false	true	<=1	*	true	true	true	>1	*	error
<=1	*	true	false	true	>1	*	*	*	*	*	*	error
<=1	*	true	true	false	<=1	false	*	*	*	*	*	error
<=1	*	true	true	false	<=1	true	false	N/A	N/A	*	*	unknown	user	unknown	system
<=1	<=1	true	true	false	<=1	true	true	*	*	*	*	error
<=1	>1	true	true	false	<=1	true	true	false	false	<=1	*	unknown	user	known	user
<=1	>1	true	true	false	<=1	true	true	false	false	>1	*	error
<=1	>1	true	true	false	<=1	true	true	false	true	<=1	*	unknown	user	unknown	user
<=1	>1	true	true	false	<=1	true	true	false	true	>1	*	error
<=1	>1	true	true	false	<=1	true	true	true	false	<=1	false	error
<=1	>1	true	true	false	<=1	true	true	true	false	<=1	true	unknown	user	unknown	user
<=1	>1	true	true	false	<=1	true	true	true	false	>1	*	error
<=1	>1	true	true	false	<=1	true	true	true	true	<=1	false	error
<=1	>1	true	true	false	<=1	true	true	true	true	<=1	true	unknown	user	unknown	user
<=1	>1	true	true	false	<=1	true	true	true	true	>1	*	error
<=1	*	true	true	false	>1	*	*	*	*	*	*	error
<=1	*	true	true	true	<=1	false	*	*	*	*	*	error
<=1	*	true	true	true	<=1	true	false	N/A	N/A	*	*	unknown	user	unknown	system
<=1	<=1	true	true	true	<=1	true	true	*	*	*	*	error
<=1	>1	true	true	true	<=1	true	true	false	false	<=1	*	unknown	user	known	user
<=1	>1	true	true	true	<=1	true	true	false	false	>1	*	error
<=1	>1	true	true	true	<=1	true	true	false	true	<=1	*	unknown	user	unknown	user
<=1	>1	true	true	true	<=1	true	true	false	true	>1	*	error
<=1	>1	true	true	true	<=1	true	true	true	false	<=1	false	error
<=1	>1	true	true	true	<=1	true	true	true	false	<=1	true	unknown	user	unknown	user
<=1	>1	true	true	true	<=1	true	true	true	false	>1	*	error
<=1	>1	true	true	true	<=1	true	true	true	true	<=1	false	error
<=1	>1	true	true	true	<=1	true	true	true	true	<=1	true	unknown	user	unknown	user
<=1	>1	true	true	true	<=1	true	true	true	true	>1	*	error
<=1	*	true	true	true	>1	*	*	*	*	*	*	error
>1	*	false	*	*	*	*	false	*	*	*	*	error
>1	*	false					true					error
>1	*	true					false					error
>1	*	true					true					see note

Note:

when choice minOccurs = n > 1, at least n-m elements must be present in the XML, where m = the number of elements with minOccurs = 0 and which are not present in the XML, otherwise an error is thrown

2.2.2 Multi-Valued Attributes

For multi-valued attributes inside choices the same rules apply as for single-valued attributes (chapter 2.2.1). In addition, there can be situations where the number of values (elements) does not match the maxOccurs on the element inside the choice. In this case an error is thrown.

2.2.3 Single-Valued Relations

For single-valued relations the same rules apply as for single-valued attributes (chapter 2.2.1) with one difference: if an element is present (with sub-content, empty or nil) a corresponding instance is created and the relation is set. So all of the following tags result in a known, user-set value in a relation:

<A>...</A>
<A/>
<A xsi:nil="true"/>

When a tag is empty and not nil, the rules on this page apply recursively for the sub-elements that are expected conform the XSD.

When a tag is nil, an instance is created and all requirements for sub-elements are skipped. The relation is set to an instance with all its attributes and relations system-set unknown.

2.2.4 Multi-Valued Relations

For multi-valued relations the same rules apply as for single-valued relations (chapter 2.2.3). In addition, there can be situations where the number of values (elements) does not match the maxOccurs on the element inside the choice. In this case an error is thrown.

When a multi-valued relation is mapped directly to a choice, at least as many choices must be possible indicated by the minOccurs and maxOccurs on the choice. If there are too few or too many elements, an error is thrown.

Space shortcuts

Page tree

Whom is this guide for?

What is in this guide?

1. Sending an XML message

1.1 Sequences

1.1.1 Single-Valued Attributes

1.1.2 Multi-Valued Attributes

1.1.3 Single-Valued Relations

1.1.4 Multi-Valued Relations

1.2 Choices

1.2.2 Multi-Valued Attributes

1.2.3 Single-Valued Relations

1.2.4 Multi-Valued Relations

2. Receiving an XML message

2.1 Sequences

2.1.1 Single-Valued Attributes

2.1.2 Multi-Valued Attributes

2.1.3 Single-Valued Relations

2.1.4 Multi-Valued Relations

2.2 Choices

2.2.1 Single-Valued Attributes

2.2.2 Multi-Valued Attributes

2.2.3 Single-Valued Relations

2.2.4 Multi-Valued Relations

Space shortcuts

Page tree

How it works: Handling of XML messages based on XSD Schemas

Whom is this guide for?

What is in this guide?

1. Sending an XML message

1.1 Sequences

1.1.1 Single-Valued Attributes

1.1.2 Multi-Valued Attributes

1.1.3 Single-Valued Relations

1.1.4 Multi-Valued Relations

1.2 Choices

1.2.2 Multi-Valued Attributes

1.2.3 Single-Valued Relations

1.2.4 Multi-Valued Relations

2. Receiving an XML message

2.1 Sequences

2.1.1 Single-Valued Attributes

2.1.2 Multi-Valued Attributes

2.1.3 Single-Valued Relations

2.1.4 Multi-Valued Relations

2.2 Choices

2.2.1 Single-Valued Attributes

2.2.2 Multi-Valued Attributes

2.2.3 Single-Valued Relations

2.2.4 Multi-Valued Relations