DTD与XSD的一个范例

一个xml的格式如下，
Java代码  收藏代码

    <?xml version="1.0"?>  
    <!-- 本文档根元素为gridbag, 其中验证文档为gridbag.dtd -->  
    <!DOCTYPE gridbag SYSTEM "gridbag.dtd">  
    <gridbag>  
        <row>  
            <cell anchor="EAST">  
                <bean>  
                    <class>javax.swing.JLabel</class>  
                    <property>  
                        <name>text</name>  
                        <value><string>Face:</string></value>  
                    </property>  
                </bean>  
            </cell>  
            <cell fill="HORIZONTAL" weightx="100">  
                <bean id="face">  
                    <class>javax.swing.JComboBox</class>  
                </bean>  
            </cell>  
            <cell gridheight="4" fill="BOTH" weightx="100" weighty="100">  
                <bean id="sample">  
                    <class>javax.swing.JTextArea</class>  
                    <property>  
                        <name>text</name>  
                        <value><string>The quick brown fox jumps over the lazy dog</string></value>  
                    </property>  
                    <property>  
                        <name>editable</name>  
                        <value><bolean>false</bolean></value>  
                    </property>  
                    <property>  
                        <name>lineWrap</name>  
                        <value><boolean>true</boolean></value>  
                    </property>  
                    <property>  
                        <name>border</name>  
                        <value>  
                            <bean>  
                                <class>javax.swing.border.EtchedBorder</class>  
                            </bean>  
                        </value>  
                    </property>  
                </bean>  
            </cell>  
        </row>  
        <row>  
            <cell gridwidth="2" weighty="100">  
                <bean id="bold">  
                    <class>javax.swing.JCheckBox</class>  
                    <property>  
                        <name>text</name>  
                        <value><string>Bold</string></value>  
                    </property>  
                </bean>  
            </cell>  
        </row>  
        <row>  
            <cell gridwidth="2" weighty="100">  
                <bean id="italic">  
                    <class>javax.swing.JCheckBox</class>  
                    <property>  
                        <name>text</name>  
                        <value><string>Italic</string></value>  
                    </property>  
                </bean>  
            </cell>  
        </row>  
    </gridbag>  


，对就在的dtd文件格式：
Java代码  收藏代码

    <!ELEMENT gridbag (row)*>  <!--根元素是gridbag,可以多个子元素row-->  
    <!ELEMENT row(cell)*>  <!--row下面可以有多个cell子元素 -->  
    <!ELEMENT cell(bean)> <!--cell元素下只有一个bean元素-->  
    <!ATTLIST cell gridx CDATA #IMPLIED>  <!--cell有gridx属性，类型为任意文本,如果有特殊字符用相应的替代字符代替（用于属性中），可选-->  
    <!ATTLIST cell gridy CDATA #IMPLIED>   
    <!ATTLIST cell gridwidth CDATA "1"> <!--gridwidhth属性默认为1-->  
    <!ATTLIST cell gridheight CDATA "1">  
    <!ATTLIST cell weightx CDATA "0">  
    <!ATTLIST cell weighty CDATA "0">  
    <!ATTLIST cell fill (NODE|BOTH|HORIZONTAL|VERTICAL) "NONE"> <!--fill属性有几个可选值，默认为NONE-->  
    <!ATTLIST cell anchor (CENTER|NORTH|NORTHEAST|EAST|SOUTHEAST|SOUTH|SOUTHWEST|WEST|NORTHWEST) “CENTER”>  
    <!ATTLIST cell ipdx CDATA "0">  
    <!ATTLIST cell ipady CDATA "0">  
      
    <!ELEMENT bean (class, property*)> <!--bean子元素有一个class子元素，多个property子元素-->  
    <!ATTLIST bean id ID #IMPLIED> <!--bean的id属性是ID类型，也就是唯一性 -->  
      
    <!ELEMENT class (#PCDATA)> <!--class元素下面可以只包含文本也可以包含子元素，类似于ANY(用于元素中)-->  
    <!ELEMENT property (name, value)>  
    <!ELEMENT name (#PCDATA)>  
    <!ELEMENT value (int|string|boolean|bean)>  
    <!ELEMENT int (#PCDATA)>  
    <!ELEMENT string (#PCDATA)>  
    <!ELEMENT boolean (#PCDATA)>  


XSD文件格式如下
Java代码  收藏代码

    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">  
        <xsd:element name="gridbag" type="GridBagType"/><!--根元素-->  
          
        <xsd:element name="bean" type="BeanType"/>  
          
        <xsd:complexType name="GridBagType">  
            <xsd:sequence>  
                <xsd:element name="row" type="RowType" minOccurs="0" maxOccurs="unbounded"/>  
            </xsd:sequence>  
        </xsd:complexType>  
          
        <xsd:complexType name="RowType">  
            <xsd:sequence>  
                <xsd:element name="cell" type="CellType" minOccurs="0" maxOccurs="unbounded"/>  
            </xsd:sequence>  
        </xsd:complexType>  
          
        <xsd:complexType name="CellType">  
            <xsd:sequence>  
                <xsd:element ref="bean"></xsd:element>  
            </xsd:sequence>  
            <xsd:attribute name="gridx" type="xsd:int" use="optional"/>  
            <xsd:attribute name="gridy" type="xsd:int" use="optional"></xsd:attribute>  
            <xsd:attribute name="gridwidth" type="xsd:int" use="optional" default="1"></xsd:attribute>  
            <xsd:attribute name="gridheight" type="xsd:int" use="optional" default="1"/>  
            <xsd:attribute name="weightx" type="xsd:int" use="optional" default="0"/>  
            <xsd:attribute name="weighty" type="xsd:int" use="optional" default="0"/>  
            <xsd:attribute name="fill" use="optional" default="NONE">  
                <xsd:simpleType>  
                    <xsd:retriction base="xsd:string">  
                        <xsd:enumeration value="NONE"/>  
                        <xsd:enumeration value="BOTH"/>  
                        <xsd:enumeration value="HORIZONTAL"/>  
                        <xsd:enumeration value="VERTICAL"></xsd:enumeration>  
                    </xsd:retriction>  
                </xsd:simpleType>  
            </xsd:attribute>  
            <xsd:attribute name="anchor" use="optional" default="CENTER">  
                <xsd:simpleType>  
                    <xsd:retriction base="xsd:string">  
                        <xsd:enumeration value="CENTER"></xsd:enumeration>  
                        <xsd:enumeration value="NORTH"/>  
                        <!-- 下面的类同 -->  
                    </xsd:retriction>  
                </xsd:simpleType>  
            </xsd:attribute>  
            <xsd:attribute name="ipady" type="xsd:int" use="optional" default="0"></xsd:attribute>  
            <xsd:attribute name="ipadx" type="xsd:int" use="optional" default="0"/>  
        </xsd:complexType>  
          
        <xsd:complexType name="BeanType">  
            <xsd:sequence>  
                <xsd:element name="class" type="xsd:string"/>  
                <xsd:element name="property" type="PropertyType" minOccurs="0" maxOccurs="unbounded"/>  
            </xsd:sequence>  
            <xsd:attibute name="id" type="xsd:ID" use="optional"></xsd:attibute>  
        </xsd:complexType>  
          
        <xsd:complexType name="PropertyType">  
            <xsd:sequence>  
                <xsd:element name="name" tyype="xsd:string"/>  
                <xsd:element name="value" type="ValueType"/>  
            </xsd:sequence>  
        </xsd:complexType>  
          
        <xsd:complexType>  
            <xsd:choice>  
                <xsd:element ref="bean"/>  
                <xsd:element name="int" type="xsd:int"/>  
                <xsd:element name="string" type="xsd:string"/>  
                <xsd:element name="boolean" type="xsd:boolean"/>  
            </xsd:choice>  
        </xsd:complexType>  
    </xsd:schema>  



DTD比XSD简单，功能上也相对较弱