中文XML论坛--小弟有些问题请教!!!!!!!!!!!

贴子主题：小弟有些问题请教!!!!!!!!!!!

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

<xs:schema targetNamespace="http://www.org.com/gbs/po"
      xmlns="http://www.org.com/gbs/po"
     xmlns:xs="http://www.w3.org/2001/XMLSchema"
     elementFormDefault="qualified"
     attributeFormDefault="unqualified" version="1.6">

<xs:annotation>
<xs:documentation xml:lang="en">
         GBS PO BATCH Schema
         version: 1.6
         author: pp AG, kevin
          pp AG, geoger
          date: 12. October 2004.
         Conforms to W3C CR XML Schema 2000-10-24
        1.1 2004-10-26 MWE Changed from xs:import to xs:include
        1.2 2004-11-04 OS remove PO Prefix
        1.3 2004-11-04 OS remove PO Prefix
        1.4 2004-12-08 OS Add Footer element
        1.5 2004-12-09 MWE purchase order element min occurs 0 for Result on batch
             level base ( footer element only)
        1.6 2005-02-23 OS Update Documentation
             </xs:documentation>
</xs:annotation>

<xs:include schemaLocation="PO_V1.xsd"/>

<xs:element name="PurchaseOrderBatch">
        <xs:complexType>
            <xs:sequence>
<xs:annotation>
    <xs:documentation>The PurchaseOrderBatch should contain at most 500 Purchase Orders which might be different Purchase Orders (create, reject, accept, etc)  and Footer element is optional. </xs:documentation>
</xs:annotation>
       <xs:element ref="PurchaseOrder" minOccurs="0" maxOccurs="500"/>
      <xs:element ref="Footer" minOccurs="0"/>
</xs:sequence>
        </xs:complexType>
</xs:element>
</xs:schema>

请问!!<xs:annotation></xs:annotation>
<xs:include schemaLocation="PO_V1.xsd"/>
之间的内容算是什么呢?是不是可以验证相对应的xml呢?是不是根据它也可以写出XML对应的格式呢?小弟十分迷惑!!!!!!!!


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