searching an XML doc

[Gowri]

On Jan 15, 3:49 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Gowri schrieb:
>
> > Hello,
>
> > I've been reading about ElementTreee and ElementPath so I could use
> > them to find the right elements in the DOM. Unfortunately neither of
> > these seem to offer XPath like capabilities where I can find elements
> > based on tag, attribute values etc. Are there any libraries which can
> > give me XPath like functionality?
>
> lxml does that.
>
> Diez

Hi Diez

I was trying lxml out and was unable to find any examples that would
help me parse an XML file with namespaces. For example, my XML file
looks like this:

<phedexData xmlns="http://a.b.com/phedex"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://a.b.com/phedex requests.xsd">
	<!--  Low priority replication request -->
	<request id="1234" last_update="1060199000.0">
		<status>
			<approved>T1_RAL_MSS</approved>
			<approved>T2_London_ICHEP</approved>
			<disapproved>T2_Southgrid_Bristol</disapproved>
			<pending/>
			<move_pending/>
		</status>
		<subscription open="1" priority="0" type="replicate">
			<items>
				<dataset>/PrimaryDS1/ProcessedDS1/Tier</dataset>
					<block>/PrimaryDS2/ProcessedDS2/Tier/block</block>
			</items>
		</subscription>
	</request>
</phedexData>

If my Xpath query is //request, it obviously would not work. Is there
some sort of namespace registration etc. that is to be done before
issuing a query? Example code would help a lot.