Positions in Relation to Parent Nodes

Positions are relative to the parent. Consider the following data, which has line numbers on the left for explanation only.


1 <x> 2 <z> 3 <z/> 4 </x> 5 <x> 6 <y> 7 <y/> 8 </x> 9 <x> 10 <y> 11 <y/> 12 </x>

The following query returns the first y element contained in each x element. It returns the elements on lines 6 and 10. The XPath processor finds all x elements. For each x element, the XPath processor then returns the first y element it finds.


x/y[1]

The next query returns the first y element that is contained in an x element that is in the context node set. It returns the element on line 6. The XPath processor finds all y elements inside x elements. The XPath processor then returns the first element in that set.


(x/y)[1]

The next query returns the empty set. The XPath processor finds the first x element. It then searches that first x element for the first y. Because the first x element does not contain a y element, this query returns the empty set.


x[1]/y[1]

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