Somehow the one of the attachment (openjpa_orm_1_0.xsd) from my previous note did not make it to this forum.

Try again here.
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<?xml version="1.0" encoding="UTF-8"?>
<!--
    OpenJPA specific orm.xml schema locates in: (E.g.)
        http://incubator.apache.org/openjpa/xml/ns/persistence/openjpa_orm_1_0.xsd"

    This schema extends http://java.sun.com/xml/ns/persistence/orm_1_0.xsd with
        OpenJPA specific stanza and uses the same name space as
            "http://java.sun.com/xml/ns/persistence/orm"
-->
<xsd:schema
                 version="1.0"
               xmlns:xsd="http://www.w3.org/2001/XMLSchema"
         targetNamespace=" http://java.sun.com/xml/ns/persistence/orm"
               xmlns:orm="http://java.sun.com/xml/ns/persistence/orm"
      elementFormDefault="qualified"
    attributeFormDefault="unqualified"
  >

  <xsd:annotation>
    <xsd:documentation>
      @(#)openjpa_orm_1_0.xsd 1.0  Jan 22 2007
    </xsd:documentation>
  </xsd:annotation>
  <xsd:annotation>
     <xsd:documentation><![CDATA[

       This is the XML Schema for extending the persistence object-relational
       mapping file for OpenJPA specific features.

       The file may be named "META-INF/orm.xml" in the persistence
       archive or it may be named some other name which would be
       used to locate the file as resource on the classpath.

     ]]></xsd:documentation>
  </xsd:annotation>

  <!-- Redefine the orm_1_0.xsd with additional OpenJPA extensions -->
  <xsd:redefine schemaLocation="http://java.sun.com/xml/ns/persistence/orm_1_0.xsd ">

    <!--
        Append optional single <data-cache> element to <entity>.
          Valid values are "true" | "false" | "1" | "0".
          Default value is "false".
    -->
    <xsd:complexType name="entity">
      <xsd:complexContent>
        <xsd:extension base="orm:entity">
          <xsd:sequence>
            <xsd:element name="data-cache" type="xsd:boolean" minOccurs="0" maxOccurs="1" default="false"/>
          </xsd:sequence>
        </xsd:extension>
      </xsd:complexContent>
    </xsd:complexType>


    <!--
        Append optional single <jdbc-nonpolymorphic> element to <one-to-many>.
          Valid values are "true" | "false" | "1" | "0".
          Default value is "false".

        Append optional single <jdbc-eager-fetch-mode> element to <one-to-many>.
          Valid values are "parallel" | "others".
          Default value is "parallel".
    -->
    <xsd:complexType name="one-to-many">
      <xsd:complexContent>
        <xsd:extension base="orm:one-to-many">
          <xsd:sequence>

            <xsd:element name="jdbc-nonpolymorphic" type="xsd:boolean" minOccurs="0" maxOccurs="1" default="false"/>

            <xsd:element name="jdbc-eager-fetch-mode" minOccurs="0" maxOccurs="1" default="parallel">
              <xsd:simpleType>
                <xsd:restriction base="xsd:string">
                  <xsd:enumeration value="parallel"/>
                  <xsd:enumeration value="others"/>
                </xsd:restriction>
              </xsd:simpleType>
            </xsd:element>

          </xsd:sequence>
        </xsd:extension>
      </xsd:complexContent>
    </xsd:complexType>

  </xsd:redefine>

</xsd:schema>


Albert Lee