Hello

How can I Test the Cardinality of Sequences with Tamino’s XQuery ??

like this 3 functions supported by XPath 2.0 and XQuery 1.0
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fn:zero-or-one(item,item,…) Returns the argument if it contains zero or one items, otherwise it raises an error
fn:one-or-more(item,item,…) Returns the argument if it contains one or more items, otherwise it raises an error
fn:exactly-one(item,item,…) Returns the argument if it contains exactly one item, otherwise it raises an error.

These functions are not supported in Tamino. You can use the count function to achieve the same purpose