How to parse xml with namespase value in XMl:LibXML?

[ravi06]

<book>
<book:chapter id="bk444444ch1" type="CHAPTER">
<book:locator xlink:href="/book/isbn/979-0-4444-1000-17/book-part/chap
+ter/bk444444ch1?releaseStatus=RELEASED" xlink:title="Photonic crystal
+ light-emitting sources" xlink:type="locator" xmlns:xlink="http://www
+.w3.org/1999/xlink"/>
<book:locator xlink:href="/book/isbn/979-0-4444-1000-17/book-part/chap
+ter/bk444444ch1?releaseStatus=RELEASED&amp;format=pdf" xlink:title="P
+hotonic crystal light-emitting sources" xlink:type="locator" xmlns:xl
+ink="http://www.w3.org/1999/xlink"/>
<book:locator xlink:href="/book/isbn/979-0-4444-1000-17/book-part/chap
+ter/bk444444ch1?releaseStatus=RELEASED&amp;format=epub" xlink:title="
+Photonic crystal light-emitting sources" xlink:type="locator" xmlns:x
+link="http://www.w3.org/1999/xlink"/>
</book>

How can i get "xlink:href" of first instance of book:locator?

[Anonymous Monk]

Its simple, define the namespace in an xpathcontext -- isn't xml/xpath fun :)

It also helps to have valid xml

Re: XML::LibXML and namespaces, Re^2: Namespaced XML::LibXML XPath query (not a bug)

The XML FIles: Understanding XML Namespaces, Re: XML::LibXSLT ignoring namespace on some Win32 machines (libxslt-1.1.27 bug), Re^2: XML::LibXML and namespaces, Re^2: XML::LibXML and namespaces, Re: XML::LibXML and namespaces, XPATH DOM traverse html/xml,

[Anonymous Monk]

Using http://www.xpathtester.com/ to fixup the xml I get
Read more... (2 kB)

And then setns/query using xmllint --shell

Read more... (2 kB)

[ravi06]

But when I am trying to access the nodes as below I don't get any value.

print $chapter_node->findvalue('./book:locator/@xlink:href') . "\n";

Could you please elaborate a bit or point out where I am committing mistake?