Any expression within a predicate.
A PredicateExpr can be any X-Query expression. If this
expression results in a numeric value, then it is a numeric predicate,
otherwise it is a Boolean predicate. See Predicate for more
details.
It corresponds to the expression PredicateExpr defined in
XPath, Section
2.4, Rule 9.
Select all patients that have a next of kin (all patient
nodes that have at least one immediate child element
nextofkin):
/patient[nextofkin]
Expr |
Predicate |
Step |