Compare a processing instruction and get the file name - xslt

Question

I'm writing an XSLT in which I need to see if a value is in preprocessing instruction. In my XML, the preprocessing looks like below.
<?xpp MAIN;1;1;0;0;69;0;0?>
Sample XML
<root>
<?xpp MAIN;1;0;0;0;73;0;0?>
<preface role="guideline">
<title>title</title>
<section role="group">
<para>data</para>
</section>
<section role="group">
<title>
<?xpp lp;0.5p?>Licences</title>
<itemizedlist mark="bullet">
<listitem>
<para>itemdata</para>
</listitem>
</itemizedlist>
</section>
<section role="group">
<title>
<?xpp lp;0.5p?>Letters to the Editor</title>
<itemizedlist mark="bullet">
<listitem>
<para><?xpp MAIN;1;0;0;0;74;0;0?>item data</para>
</listitem>
</itemizedlist>
</section>
</preface>
</root>
Sample1 XML
<root>
<?xpp MAIN;1;0;0;0;83;0;0?>
<preface role="guideline">
<title>title</title>
<section role="group">
<para>data</para>
</section>
<section role="group">
<title>
<?xpp lp;0.5p?>Licences</title>
<itemizedlist mark="bullet">
<listitem>
<para>itemdata</para>
</listitem>
</itemizedlist>
</section>
<section role="group">
<title>
<?xpp lp;0.5p?>Letters to the Editor</title>
<itemizedlist mark="bullet">
<listitem>
<para><?xpp MAIN;1;0;0;0;84;0;0?>item data</para>
</listitem>
</itemizedlist>
</section>
</preface>
</root>
For the below XML, I need to do the task of going through files and checking for the data. The Above sample XML and Sample1 XML are the files that I've loop through.
<root>
<table frame="none" tabstyle="wrap4">
<tgroup cols="4">
<colspec colnum="1" colname="col1" colwidth="10*"/>
<colspec colnum="2" colname="COLSPEC0" colwidth="10.00*"/>
<colspec colnum="3" colname="col2" colwidth="275*"/>
<colspec colnum="4" colname="col3" colwidth="15*"/>
<tbody>
<row>
<entry colsep="0" rowsep="0">Text1</entry>
<entry colsep="0" rowsep="0"/>
<entry colsep="0" rowsep="0"/>
<entry colsep="0" rowsep="0" align="right">75</entry>
</row>
<row>
<entry colsep="0" rowsep="0">Text2</entry>
<entry colsep="0" rowsep="0"/>
<entry colsep="0" rowsep="0"/>
<entry colsep="0" rowsep="0" align="right">84</entry>
</row>
</tbody>
</tgroup>
</table>
</root>
Here first I'm trying to loop through all the files available, in each file, look for the preprocessing containing MAIN in it and then see if my value is present in that preprocessing instruction. Below is my XSLT block.
<xsl:template match="entry[#align='right']" mode="y">
<xsl:analyze-string select="." regex="([0-9]+)">
<xsl:matching-substring>
<xsl:variable name="prent" select="document(document('file:///C:\Users\userId\Desktop\Proview\AUS Journal\02FEB/title.xml')/entry/file/#name)/*[contains(//root/processing-instruction('xpp')[contains(.,'MAIN')],regex-group(1))]/substring-before(tokenize(document-uri(/), '/')[last()], '.')"/>
<xsl:variable name="cha">
<xsl:value-of select="$prent"/>
</xsl:variable>
<xsl:variable name="size">
<xsl:value-of select="string-length($cha)"/>
</xsl:variable>
<xsl:variable name="conct">
<xsl:value-of select="concat($cha,'/pg_',.)"/>
</xsl:variable>
<a href="{$conct}">
<xsl:value-of select="regex-group(1)"/>
</a>
</xsl:matching-substring>
<xsl:non-matching-substring>
<xsl:value-of select="."/>
</xsl:non-matching-substring>
</xsl:analyze-string>
</xsl:template>
When I run this I get the below error.
XSLT 2.0 Debugging Error: Error: file:///C:/Users/userId/Desktop/Proview/AUS%20Journal/02FEB/XSLT/Journal.xsl:674: Wrong occurrence to match required sequence type - Details: - XPTY0004: The supplied sequence ('2' item(s)) has the wrong occurrence to match the sequence type xs:string ('zero or one').
please let me know how can I fix this and get job done.
Thanks

Answer 1

Try whether changing the step
*[contains(//root/processing-instruction('xpp')[contains(.,'MAIN')],regex-group(1))]
to
*[//root/processing-instruction('xpp')[contains(.,'MAIN')][contains(., regex-group(1))]]
fixes the problem.