Problem in understanding the XML tag

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

XML

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

the complete tags are

XML

<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>

Posted 12-Oct-12 1:43am

Menon Santosh

Updated 12-Oct-12 2:13am

v3

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Valery Possoz · Accepted Answer · 2012-10-12T02:28:00

Solution 1

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.

Posted 12-Oct-12 2:28am

Valery Possoz

Updated 12-Oct-12 2:41am

v3

Comments

Menon Santosh 12-Oct-12 8:35am

what does this mean 'characters between " " and or "~"' plz make me understand with example

Valery Possoz 12-Oct-12 8:39am

" " is ASCII code 20... "~" is ASCII 126. Any character whose code is between 20 and 126 will be ok.
http://www.asciitable.com/

Menon Santosh 12-Oct-12 8:56am

thanks