理解XML标签时出现问题 [英] Problem in understanding the XML tag

问题描述

以下标记的含义是什么，该标记是对XSD文件中字符串的验证.

What is the meaning of following tag, This tag is the validation for a string in XSD file

<xs:pattern value="([ -~])*"/>

完整的标签是

the complete tags are

<xs:element name="DESCRIPTION-OF-GOODS">
        <xs:simpleType>
            <xs:restriction base="xs:string">
                <xs:maxLength value="255"/>
                <xs:minLength value="1"/>
                <xs:pattern value="([ -~])*"/>
            </xs:restriction>
        </xs:simpleType>
    </xs:element>

推荐答案

您好，

这是一个正则表达式模式(RegEx).

xs:pattern value =([-〜])*"

[] 是一个字符类，这意味着它将与所有类中的一个字符匹配.
-表示一个字符范围，此处所有字符从"到〜"
()是一个组
* 表示您希望的时间.

因此，从根本上讲，这意味着您可以根据需要多次重复"和〜"之间的任何字符.其他任何字符都将使节点无效.

在此处查看详细信息:
http://www.regular-expressions.info/reference.html [

Hello,

This is a Regular expression pattern(RegEx).

xs:pattern value="([ -~])*"

[ ] is a character class, that means it will match one character out of all the class possibilities.
- means a range of characters, here all characters from " " to "~"
( )is a group
* means as many time as you wish.

So basically it means that you can have any characters between " " and "~" repeated as often as you want. Any other character will make the node invalid.

See details here:
http://www.regular-expressions.info/reference.html[^]

Valery.

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