This schema imports a schema for XHTML.

It then refers to the element declaration for the 'p' element.

Example:

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
   targetNamespace="urn:publicid:IDN+cde.berkeley.edu:schemas:examples:snippet:us"
   xmlns:h="http://www.w3.org/1999/xhtml"
>

   <xs:import namespace="http://www.w3.org/1999/xhtml"
              schemaLocation="xhtml.xsd"/>

   <xs:element name="snippet">
      <xs:complexType>
         <xs:sequence>
            <xs:element ref="h:p" maxOccurs="unbounded"/>
         </xs:sequence>
      </xs:complexType>
   </xs:element>

</xs:schema>