RE: How to use DTD and Schema in the single XML file?

> 
> I using DTD for parsing the XML file, Suppose the xml have 
> 100 elements and I want to validate just 10 element then How 
> can I write the schema? and validate?

There are not many tools that offer selective validation at the element
level, but you can do it with a schema-aware XQuery or XSLT 2.0 stylesheet:

<xsl:template match="element-to-be-validated">
  <xsl:copy-of select="." validation="strict"/>
</xsl:template>

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