[xsl] Grouping - using Referenced Schema

Hi,

I am new to XSLT. I have to group based on a node.

The source schema is a referenced Schema hence I am using Qualified
Name in XPath.

In a normal scenario we will use like

<xsl:variable name="unique-countries"
select="//cities/city[not(country=preceding-sibling::city/country)]/country"
/>

If using referenced schema then how to use the preceding sibling ???

<xsl:variable name="unique-countries"
select="/*[local-name()='cities' and
namespace-uri()='http://ABC/XYZ']/[local-name()='city' and
namespace-uri()='http://ABC/XYY'][not(country=preceding-sibling::city/country)]/*[local-name()='country'
and namespace-uri()='http://ABC/QWE']" />


Thanks in advance

--
Thanks,
Karthik

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