MarkLogic 9 Product Documentation

sem.isBlank

sem.isBlank(
   value as xs.anyAtomicType
) as Boolean

Summary

Returns true if the argument is an RDF blank node - that is, derived from type sem:blank. This XQuery function backs up the SPARQL isBlank() function.

This function is a built-in.

Example

sem.isBlank(sem.bnode());
=>
true