XML Validation of Hibernate Mapping File

Here is the entire .hbm.xml file. It was hand coded.

 <?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
  "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
  "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping package="com.orangefood.commerce.catalog">
    <class name="SkuImpl" table="sku">
        <cache usage="read-write"/>
        <id name="id" column="sku_id">
            <generator class="native"/>
        </id>
        <version name="version" />
        <property name="name" not-null="true"/>
        <property name="skuNumber" column="sku_number" not-null="true" index="sku_number_ndx"/>
        <property name="startDate" column="start_date"/>
        <property name="endDate" column="end_date"/>
        <property name="listPrice" column="list_price" not-null="true"/>
        <property name="salePrice" column="sale_price" not-null="true"/>
        <property name="onSale" column="on_sale" not-null="true"/>
        <many-to-one name="productAssignment" column="product_id" foreign-key="prod_sku_fk"/>
        <set
            name="productSkuRelationships"
            lazy="true"
            inverse="true"
            cascade="all-delete-orphan">
            <cache usage="read-write"/>
            <key column="sku_id" foreign-key="prod_rel_sku_fk" />
            <one-to-many class="ProductSkuRelationship"/>
        </set>
        <set name="textSet" table="sku_text" lazy="true" cascade="all">
            <cache usage="read-write"/>
            <key column="sku_id" foreign-key="text_sku_fk"/>
            <composite-element class="com.orangefood.java.i18n.LocalizedContentImpl">
                <property name="name"/>
                <property name="content" length="4000"/>
                <property name="locale"/>
            </composite-element>
        </set>
        <set name="mediaSet" table="sku_media" lazy="true" cascade="all"> 
            <cache usage="read-write"/>
            <key column="sku_id" foreign-key="media_sku_fk"/>
            <composite-element class="com.orangefood.java.i18n.LocalizedContentImpl">
                <property name="name"/>
                <property name="content" length="1000"/>
                <property name="locale"/>
            </composite-element>
        </set>
    </class>
</hibernate-mapping>

When I look at the DTD from http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd
I see

 <!-- Property of an entity class or component, component-element, composite-id, etc. 
JavaBeans style properties are mapped to table columns. -->

<!ELEMENT property (meta*,column*)>
  <!ATTLIST property name CDATA #REQUIRED>
  <!ATTLIST property access CDATA #IMPLIED>
  <!ATTLIST property type CDATA #IMPLIED>
  <!ATTLIST property column CDATA #IMPLIED>
  <!ATTLIST property length CDATA #IMPLIED>
  <!ATTLIST property not-null (true|false) "false">
  <!ATTLIST property unique (true|false) "false">
  <!ATTLIST property update (true|false) "true">   <!-- only supported for properties of a class (not component) -->
  <!ATTLIST property insert (true|false) "true">   <!-- only supported for properties of a class (not component) -->
  <!ATTLIST property formula CDATA #IMPLIED>       <!-- only supported for properties of a class (not component) -->
  <!ATTLIST property index CDATA #IMPLIED>         <!-- include the columns spanned by this property in an index -->

which does have an ‘index’ attribute for the property element, no?

Thanks. So in the mean time can is there a way I can replace the DTD in the XML Catalog with the remote one?