Delete a node sequence.
The following construct(s) refer to this construct:
A DeleteClause is part of an UpdateExpr and
deletes the node sequence that is the result of the evaluation of the
expression following the keyword delete.
Strip all comments in the documents of the current collection:
update delete input()//comment()
Delete all books that do not have a publishing year:
update delete input()/bib/book[not(@year)]
For the sample data provided, year is a
required attribute of the element book, so the
expression evaluates to an empty sequence and none of the
book elements are deleted.
Clear all element nodes in the current collection:
update delete input()//*/text()
The expression evaluates to all element nodes. Their text contents are deleted, but neither the elements themselves nor their attributes are deleted.
