//ddd[@name]
Select all elements of type "ddd" which have property "name"//ddd[@name]
... <aaa> <bbb> <ccc> <ddd id="1" name="a">this</ddd> <ddd id="2"></ddd> <ddd id="3" name="b">this</ddd> <fff></fff> </ccc> </bbb> </aaa> ...