XML note

XML: EXtensible Makeup Language

[charactors]

1. self-description

2. tree-structure

3. case-sensitive

[terms]

1. XML declaration

2. element

2.1 root element

2.2 leaf element

3. property of element: ""

4. 实体引用entity reference

5. comments

6. namespace

[Well-formed XML]

1. root element

2. close tab

3. case-sensitive

4. correctly nested

5. quote the properties

[notes]

1. save meta-data as properties,while save data as elements

2. use DTD(Document Type Definition,only surported by IE) or XML Schema to validate XML files

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