RE: [xsl] Check for duplicate @id's - collection()

["Michael Kay" <mike@xxxxxxxxxxxx>]

<xsl:for-each-group select="collection(...)//@id" group-by=".">
  <xsl:if test="count(current-group()) ne 1">
    <xsl:message>Id value <xsl:value-of select="current-grouping-key()"/> is
duplicated in files
      <xsl:value-of select="current-group()/document-uri(/)" separator=" and
"/></xsl:message>
  </xsl:if>
</xsl:for-each-group>

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: Philip Vallone [mailto:philip.vallone@xxxxxxxxxxx] 
> Sent: 19 July 2008 16:28
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] Check for duplicate @id's - collection()
> 
> Hi,
>  
> I have a project were I take about 800 files and transform 
> them into one .fo document (create a pdf). The files are 
> authored independent of each other (stand alone) which are 
> validated against a schema (independently). If there is a 
> duplicate @id attribute, the validator will tell me. However, 
> the @ids need to be unique across all files processed by the 
> collection function. If they are not, my resulting .fo will 
> have duplicate @ids, which cause FOP to halt.
> 
> I am looking for a way to (query or xslt 2.0) to check for 
> duplicate @id's values across all files with the collection 
> function. This would be a pre-production check.
> 
> I am looking for ideas or suggestions. Also, I am using Saxon 9.1.0.1
> 
> Thanks,
> 
> Phil