Insert elment in XSD

Hello Martin Honnen and Florent Georges!

Now I have another problem. In the stylesheet article will be one param
like this:

  <xsl:param name="class">article</xsl:param>

Instead of use 'article' like in your solutions, I need to use $class

<xsl:template match="xs:element[@name=$class]/xs:complexType/xs:all">

but occurs an error and I don't know how correct it

This is my XSD:

<?xml version="1.0" encoding="UTF-8"?>

<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified"
  targetNamespace="http://bibtexml.sf.net/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
  xmlns:ns1="http://bibtexml.sf.net/" version="2.0">

  <xs:import namespace="http://purl.org/dc/elements/1.1/"
schemaLocation="dc.xsd"/>

    <xs:element name="article">
    <xs:complexType>
      <xs:all>

        <xs:element ref="ns1:author" minOccurs="1" maxOccurs="1"/>
        <xs:element ref="ns1:title" minOccurs="1" maxOccurs="1"/>

      </xs:all>
    </xs:complexType>
  </xs:element>


Somebody could help me?

Thank You.