XPath 2.0

In:
http://web3.w3.org/TR/xpath20/#id-order-comparisons

Order Comparisons

precedes operator is defined:

A comparison with the precedes operator returns true if the first operand 
node is reachable from the second operand node using the preceding axis; 
otherwise it returns false.


In this way ancestors of the node are ignored and so e.g.:

<aaa id="a1">

<bbb id="a2"/>
</aaa>


id('a1') precedes id('a2') 

will return "false"


It seems to me a bit strange.
I would expect "true" as the document node will be sooner in 
document order


Is there any reason why not to use ancestor and preceding axis in the 
comparison?

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<firstName> Miloslav </firstName>
<surname>   Nic      </surname>

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