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Function	Description
`ISNULL`	Checks whether a value is unknown.
`ISUNKNOWN`	Replaces a value if that value is unknown.
`IFUNKNOWN`	Alternative notation of the ISUNKOWN function, which increases readability especially for long expressions.
`IS A`	Checks the entity type of an instance.
`TYPE OF`	Determines the entity type of an instance.
`ISACTIVE`	Determines if an instance of a specific entity type is currently active.
`GUID`	Generates a globally unique identifier which can later be used to uniquely mark and recognize a desired element.

Functions

Include Page

	Miscellaneous function ISNULL
	Miscellaneous function ISNULL

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