Re: [xml-dev] Problem in XML Schema.

[Eric van der Vlist <vdv@dyomedea.com>]

abhay_c wrote:

> Hi,
> 
> I am facing a problem in validating a xml with schema. I need to write 
> schema which supports attributes for leaf elements. Attached is the 
> sample I tried and the parser IBM XML4C 3.5.1 gives the following error.
> 
> Error at file "D:\Buysell.xml", line 4, column 135
>    Message: The type 'xs:string' is a simple type. It cannot be used in 
> a deriva
> tion by RESTRICTION for a complexType
> 
> Can somebody tell me what is wrong with the schema and how can I fix it 
> with the requirement described above. Please help out.


yes, you've missed a step ;) ...

You need to define your simple type before using it to create a complex 
content:

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 
elementFormDefault="qualified" attributeFormDefault="unqualified">
	<xs:simpleType name="BuyOrSell">
		<xs:restriction base="xs:string">
			<xs:enumeration value="BUY"/>
			<xs:enumeration value="SELL"/>
		</xs:restriction>
	</xs:simpleType>
	<xs:element name="BuySellInd">
		<xs:complexType>
			<xs:simpleContent>
				<xs:extension base="BuyOrSell">
					<xs:attribute name="elementID" type="xs:string"/>
         </xs:extension>
			</xs:simpleContent>
		</xs:complexType>
	</xs:element>
</xs:schema>

Also, you may consider deriving "BuyOrSell" from xs:token (or adding a 
whitespace facet) if your values may content leading or trailing 
whitespaces.


Hope this helps.

Eric


> 
> Regards,
> 
> Abhay.
> 



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