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Regular Expression for XML attribute

 

Regular Expression for XML attribute
agent_logic

25 Jun, 2009 - 02:51 AM
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Hi,

I'm developing an XML Schema as part of my assignment, and one requirement has an "id" attribute which must be *unique*, and must begin with an alphabet, followed by 8 digits. This is what I did:

CODE

<element name="employee">
...
...
<attribute name="id" type="ID">
    <simpleType>
        <restriction base="string">
            <pattern value="[A-Z]{1}[0-9]{8}" />
        </restriction>
    </simpleType>
</attribute>
...
...
</element>


When I validate my xml document, the Xerces-C parser complains that "attribute 'id' cannot have both 'type' attribute and simpleType definition." Is there any other way I can ensure the attribute values would be unique in the xml document, since I apparently can't have a cake and eat it sad.gif?

Thanks in advance.

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RudiVisser

RE: Regular Expression For XML Attribute

25 Jun, 2009 - 03:24 AM
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Do exactly what it says, remove simpleType..
CODE
<attribute name="id" type="ID" />


It's always going to be unique.
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agent_logic

RE: Regular Expression For XML Attribute

25 Jun, 2009 - 03:32 AM
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Hi MageUK,

Thanks for your reply. I know the ID attribute ensures unique values, but there is another constraint which requires that the attribute begin with one alphabet character, followed by 8 digits.
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RudiVisser

RE: Regular Expression For XML Attribute

25 Jun, 2009 - 03:38 AM
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Personally I'd just make the application that is going to parse docs around this scheme validate the field themselves.

I took a look around on Google and I don't think there's any other way to do it (Apart from an XPath pattern if that applies, not sure).
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agent_logic

RE: Regular Expression For XML Attribute

25 Jun, 2009 - 03:51 AM
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Yeah, that struck me too. Doing it that way saves you quite a bit of dirty work developing the xml schema! But unfortunately, it's a requirement for my assignment. I might have to take a look at XPath, very new to it.
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