Grammatical Architectures

The cardinality() function returns a boolean value depending on whether the cardinality of the collection of nodes is present in the cards string

If the collection of nodes is empty and the cards argument contains “0” return true.

If the collection of nodes contains a single node and the cards argument contains “1” return true.

If the collection of nodes contains more than one node and the cards argument contains “M” return true.

Otherwise, return false.

Argument	Kind	Required	Purpose
expression	nodes	yes	an XPath expression that resolves to some number, possibly zero, of nodes
cards	string	yes	a string value containing one or more of “0”, “1” and “M”

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