[英]XML Doctype, how to apply
如何在xml中應用文檔類型?
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE application [
<!ELEMENT application (#PCDATA)>
]>
<application>
<settings>
<environment use="production" />
<database datasource="MySQL" environment="production" />
<database datasource="MySQL" environment="development" />
<import>
<path value="Application" />
<path value="Application/Library" />
</import>
</settings>
<environment name="production">
<database>
<hostname value="127.0.0.1" />
<username value="root" />
<password value="" />
<database value="app" />
</database>
</environment>
<environment name="development">
<database>
<hostname value="127.0.0.1" />
<username value="root" />
<password value="" />
<database value="app" />
</database>
</environment>
</application>
我還想驗證XML中必須包含的元素和屬性,例如環境設置,您必須具有此節點,以及如何創建可以由各種XML實現的單個doctype,因此如何驗證。我使用XSD文件驗證XML?
嘗試以下模式(您需要填充類型定義):
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://example.com/sample"
xmlns="http://example.com/sample">
<xs:element name="application">
<xs:complexType>
<xs:sequence>
<xs:element name="settings" type="settingsType" />
<xs:element name="environment" maxOccurs="unbounded" type="environmentType" />
</xs:sequence>
</xs:complexType>
</xs:element>
<!-- type definitions -->
<xs:complexType name="settingsType">
... define type here...
</xs:complexType>
<xs:complexType name="environmentType">
... define type here...
</xs:complexType>
</xs:schema>
然后,通過在根節點中包含xmlns屬性,可以將要驗證的XML實例與模式關聯:
<application xmlns="http://example.com/sample">
<settings>
....
</settings>
<environment name="production">
....
</environment>
<environment name="development">
....
</environment>
</application>
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