XPATH query - one statement works and one doesn't

[supermatchgame]

I have an xml fragment from the start of a file:

<DataSourceMessage xmlns="[URL unfurl="true"]http://www.govtalk.gov.uk/Education[/URL]
/ISIndexDataSourceMessage" xmlns:apd="[URL unfurl="true"]http://www.govtalk.gov.uk/people[/URL]
/AddressAndPersonalDetails" xmlns:bs7666="[URL unfurl="true"]http://www.govtalk.gov.uk/people[/URL]
/bs7666" xmlns:cdt="[URL unfurl="true"]http://www.govtalk.gov.uk/people/ContactDetails"[/URL] 
xmlns:ind="[URL unfurl="true"]http://www.govtalk.gov.uk/Education/ISIndexCommon"[/URL] 
xmlns:xsi="[URL unfurl="true"]http://www.w3.org/2001/XMLSchema-instance"[/URL] 
xsi:schemaLocation="[URL unfurl="true"]http://www.govtalk.gov.uk/Education[/URL]
/ISIndexDataSourceMessageISIndexDataSourceMessage-v1-1.xsd">
- <DataSourceHeader>
  <ind:SourceSystemDomain /> 
  <ind:SourceSystemCode /> 
  <ind:SentTimestamp>2008-08-18T12:58:39</ind:SentTimestamp> 
  <ind:RecordCount>MADEUP</ind:RecordCount> 
  <ind:LoadAction>MADEUP</ind:LoadAction> 
  <ind:DataSourceBatchId /> 
  </DataSourceHeader>
- <DataSourceRecords>
- <ind:DataSourceRecord CorrelationId="4">
- <ind:ChildNames>
- <ind:ChildName>
  <ind:FamilyName>MADEUPDATA</ind:FamilyName>

Please can someone tell me why the following XPATH statement will return the value of the <ind:FamilyName> element:

<xsl:value-of select="//ind:FamilyName"></xsl:value-of>

but this statement won't:

<xsl:value-of select="/DataSourceMessage/DataSourceRecords
/ind:DataSourceRecord/ind:ChildNames/ind:ChildName/ind:FamilyName"/>

I'm using the XSL debug tool in Visual Studio 2005 but XPATh is XPATH regardless of platform, right?

 

[tsuji]

In your xsl document, you have to declare the namespace uri corresponding to ...ISIndexDataSourceMessage, say, usually at the root xsl:stylesheet, like this.
[tt][ignore]
xmlns:x="

http://www.govtalk.gov.uk/Education/ISIndexDataSourceMessage"

[/ignore][/tt]
Your xpath (2nd version) would look like this and it will be fine.
[tt]
<xsl:value-of select="/[red]x:[/red]DataSourceMessage/[red]x:
[/red]DataSourceRecords/indataSourceRecord/ind:ChildNames/ind:ChildName
/ind:FamilyName"/>
[/tt]

 

[supermatchgame]

Thankyou so much for your help - I always, always get the namespace information wrong!