XSLT parser/content error xml to text for doctype cesAlign -

<?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/xsl/transform"             version="1.0">    <xsl:output method="text" encoding="utf-8" />    <xsl:template match="linkgrp">     <xsl:value-of select="normalize-space()"/>     <xsl:text>&#xa;</xsl:text> <!-- newline after sentences -->   </xsl:template>  </xsl:stylesheet> 

when attempt run above xslt stylesheet on following cesalign xml doc

<?xml version="1.0" encoding="utf-8"?> <!doctype cesalign public "-//ces//dtd xml cesalign//en" ""> <cesalign version="1.0"> <linkgrp targtype="s" fromdoc="en/1976/7277/69682_1of1.xml.gz" todoc="zh/1976/7277/4041906_1of1.xml.gz"> <link id="sl0" xtargets=";1" /> <link id="sl1" xtargets="1;2" /> <link id="sl2" xtargets="2;3" /> ... 

i encounter error:

parser error : content error in external subset <!doctype cesalign public "-//ces//dtd xml cesalign//en" ""> 

is there place should specifying particular input doc type (cesalign)?

as i'm not sure expected output should - <xsl:value-of select="normalize-space()"/> result in nothing function should applied on string , not on node - wrote small xslt getting attribute values, text identifiers. specifying input doc type wasn't needed:

<?xml version="1.0" encoding="iso-8859-1"?> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/xsl/transform" version="1.0"> <xsl:output method="text" encoding="utf-8" />  <xsl:template match="/*">  <xsl:apply-templates select="linkgrp "/> </xsl:template>  <xsl:template match="linkgrp">   <xsl:text>linkgrp&#xa;</xsl:text>   <xsl:text>targtype: </xsl:text><xsl:value-of select="./@targtype"/>   <xsl:text>, fromdoc: </xsl:text><xsl:value-of select="./@fromdoc"/>   <xsl:text>, todoc: </xsl:text><xsl:value-of select="./@todoc"/>   <xsl:apply-templates select="./link"/>  </xsl:template>  <xsl:template match="link">   <xsl:text>&#xa;&#xa;link&#xa;id: </xsl:text>   <xsl:value-of select="./@id"/>   <xsl:text>, xtargets: </xsl:text>   <xsl:value-of select="./@xtargets"/> </xsl:template> </xsl:stylesheet>   

result (todoc moved manually better readability):

linkgrp targtype: s, fromdoc: en/1976/7277/69682_1of1.xml.gz,               todoc: zh/1976 /7277/4041906_1of1.xml.gz  link id: sl0, xtargets: ;1  link id: sl1, xtargets: 1;2  link id: sl2, xtargets: 2;3   

in case required output should totally different update in question it's not clear if attribute values of link groups , links or kind of copy of whole nodes.

for reference: http://www.w3.org/tr/xpath-functions/#func-normalize-space