MarkLogic 9 Product Documentation

sem.coalesce

sem.coalesce(
   parameter1 as Sequence,
   [parameterN as item()*,...]
) as Sequence

Summary

Returns the value of the first argument that evaluates without error. This XQuery function backs up the SPARQL COALESCE() functional form.

This function is a built-in.

Example

sem.coalesce("foo", "bar", "baz");
=>
foo