xpath - Specify default value in case of an empty nodeset -

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using xpath 2.0, how can specify default value in case of empty node set? i'd able tune of $datatypes/type[@key="somevalue"] or "default value" have default value returned if key not found.

may not looking for, think need have conditional expressions.

therefore try this:

if ($datatypes/type[@key="somevalue"])  $datatypes/type[@key="somevalue"]  else "default value"

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