从 DTDs 转换到 XML Schemas 时元素和属性的变化
| DTD | XML Schema |
|---|
<!ELEMENT ROOT (A,B) >
|
<element name="ROOT">
<complexType content="elementOnly">
<element ref="t:A">
<element ref="t:B">
</complexType>
<element>
|
<!ELEMENT ROOT (A|B) >
|
<element name="ROOT">
<complexType content="elementOnly">
<choice>
<element ref="t:A">
<element ref="t:B">
</choice>
</complexType>
<element>
|
<!ELEMENT ROOT (A|(B,C)) >
|
<element name="ROOT">
<complexType content="elementOnly">
<choice>
<element ref="t:A">
<sequence>
<element ref="t:B">
<element ref="t:C">
</sequence>
</choice>
</complexType>
<element>
|
<!ELEMENT ROOT (A?,B+,C*) >
|
<element name="ROOT">
<complexType content="elementOnly">
<element ref="t:A" minOccurs="0">
<element ref="t:B" maxOccurs="unbounded">
<element ref="t:C" minOccurs="0" maxOccurs="unbounded">
</complexType>
<element>
|
| DTD | XML Schema |
|---|
<!ATTLIST ROOT
a CDATA #REQUIRED>
|
<element name="ROOT">
<complexType content="elementOnly">
<attribute name="a" type="string" use="required"/>
</complexType>
<element>
|
<!ATTLIST ROOT
a CDATA #IMPLIED>
|
<element name="ROOT">
<complexType content="elementOnly">
<attribute name="a" type="string" use="optional"/>
</complexType>
<element>
|
<!ATTLIST ROOT
a (x|y|z) #REQUIRED;>
|
<element name="ROOT">
<complexType content="elementOnly">
<attribute name="a">
<simpleType base="string">
<enumeration value="x"/>
<enumeration value="y"/>
<enumeration value="z"/>
</simpleType>
</attribute>
</complexType>
<element>
|
<!ATTLIST ROOT
a CDATA #FIXED "x">
|
<element name="ROOT">
<complexType content="elementOnly">
<attribute name="a" type="string" use="fixed" value="x"/>
</complexType>
<element>
|
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博客主要介绍了从 DTDs 转换到 XML Schemas 时，元素和属性会发生变化。这属于信息技术中 XML 相关的内容，涉及到数据格式转换时的特性改变。
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