Hello everybody,

 I have a question concerning XPath expressions and namespaces.
Consider this XML:

<?xml version="1.0" encoding="UTF-8"?>
<newsMessage  	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns:rtr="http://www.reuters.com/ns/2003/08/content"
		xmlns="http://iptc.org/std/nar/2006-10-01/">
	<header>
		<transmitId>LWN_2008-07-26_892</transmitId>
		<priority>4</priority>
		<channel>VID</channel>
	</header>
	<itemSet>
		<!-- ========================================================= -->
		<!-- PRIMARY ITEM : NEP -->
		<packageItem standard="NewsML-G2" standardversion="2.1"
conformance="power"

guid="tag:reuters.com,2008:newsml_WNEI6QNH" version="2" xml:lang="en">
			<!-- ========================================================= -->
			<itemMeta>
				<itemClass qcode="icls:composite"/>
				<versionCreated>2008-07-26T15:55:37Z</versionCreated>
				<fileName>20080726954SP-FRANCE-EVIAN_GOLF.xml</fileName>
				<link rel="irel:prevVersion"

residref="tag:reuters.com,2008:newsml_WNEI6QNH" version="1"

contenttype="application/vnd.iptc.g2.packageitem+xml"
rtr:id="WNEI6QNH" rtr:type="idType:USN"/>
				<rtr:versionedId guid="tag:reuters.com,2008:newsml_WNEI6QNH:2"/>
			</itemMeta>
		</packageItem>
		<!-- ========================================================= -->
		<!-- PRIMARY ITEM : SNI-Text -->
		<newsItem standard="NewsML-G2" standardversion="2.1"
conformance="power"

guid="tag:reuters.com,2008:newsml_WNEI6QNI" version="2" xml:lang="en">
			<itemMeta>
				<itemClass qcode="icls:text"/>
				<versionCreated>2008-07-26T15:55:37Z</versionCreated>
				<fileName>20080726954SP-FRANCE-EVIAN_GOLF.xml</fileName>
				<link rel="irel:prevVersion"

residref="tag:reuters.com,2008:newsml_WNEI6QNI" version="1"

contenttype="application/vnd.iptc.g2.newsitem+xml" rtr:id="WNEI6QNI"
rtr:type="idType:USN"/>
				<rtr:versionedId guid="tag:reuters.com,2008:newsml_WNEI6QNI:2"/>
			</itemMeta>
		</newsItem>
		<!-- ========================================================= -->
		<!-- PRIMARY ITEM : SNI -Video -->
		<newsItem standard="NewsML-G2" standardversion="2.1"
conformance="power"

guid="tag:reuters.com,2008:newsml_LWNEI6Q1CDHNJ" version="1"
xml:lang="en">
			<itemMeta>
				<itemClass qcode="icls:video"/>
				<versionCreated>2008-07-26T15:55:37Z</versionCreated>
				<rtr:versionedId

guid="tag:reuters.com,2008:newsml_LWNEI6Q1CDHNJ:1"/>
			</itemMeta>
		</newsItem>
	</itemSet>
</newsMessage>



  If the "newsMessage" node has the three namespaces (xmlns:xsi,
xmlns:rtr & xmlns), my XPath

expressions like '/newsMessage/header/priority/text()' returns
nothing. But if I delete the third

namespace (xmlns), all my XPath expressions find the nodes and return
the text content except the

expression '/newsMessage/itemSet/packageItem/itemMeta/rtr:versionedId/
@guid' that returns the error:

'Reference to undeclared namespace prefix: 'rtr'.'

  Any ideas about the problem?

  Best regards
  Reyes