trueif the element has the specified parent, and
isntreverses the result.
parent element-qualifier? (is | isnt) namespace-modifier? (element-name | element-name-list)
parent is tests whether the parent of the current element of the currently-active parse is an instance
of the element element-name, or one of the elements listed in element-name-list. element-name-list is a parenthesized list of elements, separated by
isnt will reverse these results.
If element-qualifier is not specified, the test applies to the parent element of the current element. If element-qualifier is specified, the test applies to the parent element of the element specified by element-qualifier.
You can specify the name dynamically by using the identity operator (
~) followed by a
string expression: for example, to check for elements with a parent of the same name as the current