xml learning (1) several file formats of xml

1. Let’s briefly introduce XML. XML is a text-based markup language, similar to HTML, which can easily store data.

2. Several formats of XML files:

Format 1: View an XML CD directory

<?xml version="1.0" encoding="utf-8" ?>
<CATALOG>
    <CD>
        <TITLE>Empire Burlesque</TITLE>
        <ARTIST>Bob Dylan</ARTIST>
        <COUNTRY>USA</COUNTRY>
        <COMPANY>Columbia</COMPANY>
        <PRICE>10.90</PRICE>
        <YEAR>1985</YEAR>
    </CD>
    <CD>
        <TITLE>Hide your heart</TITLE>
        <ARTIST>Bonnie Tyler</ARTIST>
        <COUNTRY>UK</COUNTRY>
        <COMPANY>CBS Records</COMPANY>
        <PRICE>9.90</PRICE>
        <YEAR>1988</YEAR>
    </CD>
</CATALOG>

Format 2: View an XML school grade directory

<?xml version="1.0" encoding="utf-8" ?>
<config>
    <Header  col1="班级编号" col2="班级名称" col3="年级" col4="学校" col5="男生" col6="女生"  col7="人数"/>
    <row     col1="11" col2="一（一）班" col3="初一" col4="三峡高级中学" col5="20" col6="30"  col7="50"/>
    <row     col1="12" col2="一（二）班" col3="初一" col4="三峡高级中学" col5="18" col6="12"  col7="30"/>
    <row     col1="13" col2="一（三）班" col3="初一" col4="三峡高级中学" col5="16" col6="26"  col7="42"/>
    <row     col1="14" col2="一（四）班" col3="初一" col4="三峡高级中学" col5="23" col6="17"  col7="40"/>
</config>

3, Analysis:

1.xml can only have one root-level element and cannot have multiple root-level elements. , for example, if you add another root-level element in format 2, an error will be reported

2.xml elements can be nested in a loop. The parent element contains child elements, and the child element Level elements can contain their own child elements,

For example, format 1: root elementcontains child elements, and child elements can contain multiple child elements of their own

3. Both elements Medium form:

Form 1[Value] For example:

Form 2 ... Attribute N=[value]/>

For example:

<row     col1="11" col2="一（一）班" col3="初一" col4="三峡高级中学" col5="20" col6="30"  col7="50"/>

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