/**
* Check to ensure that this expression does not contain any inappropriate updating
* subexpressions. This check is overridden for those expressions that permit updating
* subexpressions.
*
* @throws net.sf.saxon.trans.XPathException if the expression has a non-permitted updateing
* subexpression
*/
public void checkForUpdatingSubexpressions() throws XPathException {
sequence.checkForUpdatingSubexpressions();
if (sequence.isUpdatingExpression()) {
XPathException err =
new XPathException(
"An updating expression cannot be used to initialize a variable", "XUST0001");
err.setLocator(sequence);
throw err;
}
action.checkForUpdatingSubexpressions();
}
/**
* Determine whether this is an updating expression as defined in the XQuery update specification
*
* @return true if this is an updating expression
*/
public boolean isUpdatingExpression() {
return action.isUpdatingExpression();
}