xml (EXtensible Markup L anguage) Extensible Markup Language
- < span style="font-size: 16px;">The first line must be an xml statement: Example: hr.xml
- The handling of special characters:
1. Use entity references
2. Use CDATA tags p>
CDATA is text data that should not be parsed by an XML parser
The CDATA part starts with “” and starts with “ ]]>” End
- xml semantic constraints
1. DTD (Document Type Definition: Document Type Definition) .dtd Example: hr.dtd
xml version="1.0" encoding="UTF-8" span>?>
DOCTYPE hr SYSTEM "hr.dtd">
<hr >
<employee no="3301">
<name >Li Tiezhuname>
<age >37age>
<salary >3600salary>
<department >
<dname >Personnel Departmentdname>
<address >XX Building-B105address>
department>
employee>
<employee no="3302">
<name >Lin Hainame>
<age >50age>
<salary >7000salary>
<department >
<dname >Finance Departmentdname>
<address >XX Building-B106address>
department>
employee>
hr>
2.XML Schema Currently using more .xsd Example: hr.xsd
xml version="1.0" encoding="UTF-8"?>
<schema xmlns="http://www.w3.org/2001/XMLSchema">
<element name="hr">
<complexType >
<sequence >
<element name="employee" minOccurs="1" maxOccurs="9999">
<complexType >
<sequence >
<element name="name" type="string">element>
<element name="age">
<simpleType >
<restriction base="integer">
<minInclusive value="18">minInclusive>
<maxInclusive value="60">maxInclusive>
restriction>
simpleType>
element>
<element name="salary" type="integer">element>
<element name="department">
<complexType >
<sequence >
<element name="dname" type="string">element>
<element name="address" type="string">element>
sequence>
complexType>
element>
sequence>
<attribute name="no" type="string" use="required"< span style="color: #0000ff;">>attribute> span>
complexType>
element>
sequence>
complexType>
element>
schema>
<< span style="color: #800000;">hr xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="hr.xsd">
Second part: JAVA operation XML document
Learn from: https://class.imooc.com/course/714
p>
xml version="1.0" encoding= "UTF-8"?>
DOCTYPE hr SYSTEM "hr.dtd">
<hr >
<employee no="3301">
<name >Li Tiezhuname>
<age >37age>
<salary >3600salary>
<department >
<dname >Personnel Departmentdname>
<address >XX Building-B105address>
department>
employee>
<employee no="3302">
<name >Lin Hainame>
<age >50age>
<salary >7000salary>
<department >
<dname >Finance Departmentdname>
<address >XX Building-B106address>
department>
employee>
hr>
(employee+): At least 1 employee node is allowed
(employee*): 0 to n employee nodes are allowed
(employee?): At most An employee node appears
-->
<complexType >
<sequence >
<element name="employee" minOccurs="1" maxOccurs="9999">
<complexType >
<sequence >
<element name="name" type="string">element>
<element name="age">
<simpleType >
<restriction base="integer">
<minInclusive value="18">minInclusive>
<maxInclusive value="60">maxInclusive>
restriction>
simpleType>
element>
<element name="salary" type="integer">element>
<element name="department">
<complexType >
<sequence >
<element name="dname" type="string">element>
<element name="address" type="string">element>
sequence>
complexType>
element>
sequence>
<attribute name="no" type="string" use="required"< span style="color: #0000ff;">>attribute> span>
complexType>
element>
sequence>
complexType>
element>
schema>
<hr xmlns:xsi="http://www.w3.org/2001/XMLSchema -instance"
xsi:noNamespaceSchemaLocation="hr.xsd">