in reply to Re: How to parse xml with namespase vale in XMl:LibXML? ( XPath error : Undefined namespace prefix )
in thread How to parse xml with namespase value in XMl:LibXML?

Using http://www.xpathtester.com/ to fixup the xml I get 
<?xml version="1.0" encoding="UTF-8"?>
<book xmlns:book="http://generated.ns/book">  
  <book:chapter id="bk444444ch1" type="CHAPTER"> 
    <book:locator xmlns:xlink="http://www.w3.org/1999/xlink" xlink:hre
+f="/book/isbn/979-0-4444-1000-17/book-part/chapter/bk444444ch1?releas
+eStatus=RELEASED" xlink:title="Photonic crystal light-emitting source
+s" xlink:type="locator"></book:locator>
    <book:locator xmlns:xlink="http://www.w3.org/1999/xlink" xlink:hre
+f="/book/isbn/979-0-4444-1000-17/book-part/chapter/bk444444ch1?releas
+eStatus=RELEASED&amp;format=pdf" xlink:title="Photonic crystal light-
+emitting sources" xlink:type="locator"></book:locator>
    <book:locator xmlns:xlink="http://www.w3.org/1999/xlink" xlink:hre
+f="/book/isbn/979-0-4444-1000-17/book-part/chapter/bk444444ch1?releas
+eStatus=RELEASED&amp;format=epub" xlink:title="Photonic crystal light
+-emitting sources" xlink:type="locator"></book:locator>
  </book:chapter> 
</book>

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And then setns/query using xmllint --shell 

$ xmllint.exe --shell ravi06-03.xml
/ >
/ > whereis //@xlink:href
XPath error : Undefined namespace prefix
xmlXPathEval: evaluation failed
//@xlink:href: no such node
/ >
/ > setns xlink=http://www.w3.org/1999/xlink
/ >
/ > whereis //@xlink:href
/book/book:chapter/book:locator[1]/@xlink:href
/book/book:chapter/book:locator[2]/@xlink:href
/book/book:chapter/book:locator[3]/@xlink:href
/ >
/ > cat //@xlink:href
 -------
 xlink:href="/book/isbn/979-0-4444-1000-17/book-part/chapter/bk444444c
+h1?releaseStatus=RELEASED"
 -------
 xlink:href="/book/isbn/979-0-4444-1000-17/book-part/chapter/bk444444c
+h1?releaseStatus=RELEASED&amp;format=pdf"
 -------
 xlink:href="/book/isbn/979-0-4444-1000-17/book-part/chapter/bk444444c
+h1?releaseStatus=RELEASED&amp;format=epub"
/ >
/ >
/ > cat (//@xlink:href/..)[1]
 -------
<book:locator xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="/
+book/isbn/979-0-4444-1000-17/book-part/chapter/bk4
44444ch1?releaseStatus=RELEASED" xlink:title="Photonic crystal light-e
+mitting sources" xlink:type="locator"/>
/ >
/ >
/ > bye

$

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Re^3: How to parse xml with namespase vale in XMl:LibXML? (xmllint --shell setns / xpathtester)
by ravi06 (Novice) on Jul 08, 2013 at 12:10 UTC
    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";

    [download]
    Could you please elaborate a bit or point out where I am committing mistake?
[reply]
[d/l]
      Works for me: 
      #!/usr/bin/perl
use warnings;
use strict;

use XML::LibXML;

my $xml  = XML::LibXML->load_xml(IO => *DATA);
my $root = $xml->documentElement;
my $chapter_node = $root->findnodes('book:chapter')->[0];
print $chapter_node->findvalue('./book:locator/@*') . "\n";

__DATA__
<book xmlns:book='b'> <!-- Namespace definition missing in the origina
+l data -->
<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:chapter> <!-- Missing in the original data -->
</book>

      [download]

      Note the changes I made to your data. Maybe your $chapter_node contains something else?

      لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ
[reply]
[d/l]
        Hi Choroba,

        Thanks a lot and sorry for being stupid. Actually, my objective was to get values of "xlink:href" and "xlink:title" for first occurrence of "book:locator" in Xpath context.

        Any hint or tweak on that?
[reply]

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

      Well, no, you don't show self-contained code . I guess that you didn't read my nodes and setup xpc with some setns, but I don't really have any way of knowing; also, I hate xml

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