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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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In reply to Re^2: How to parse xml with namespase vale in XMl:LibXML? (xmllint --shell setns / xpathtester) by Anonymous Monk
in thread How to parse xml with namespase value in XMl:LibXML? by ravi06

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My favorite superfluous repetitious redundant duplicative phrase is: