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Re: Attributes, simpleContent, etc.

From: Pete Cordell <petexmldev@tech-know-ware.com>
Date: Sun, 27 Nov 2005 10:05:30 -0000
Message-ID: <004d01c5f33a$25f98750$a300a8c0@RW>
To: "Jon Berndt" <jsb@hal-pc.org>, <xmlschema-dev@w3.org>

Hi Jon,

Based on a quick look, try changing the line:

        <xs:restriction base="xs:double">

and its corresponding </xs:restriction> to:

        <xs:extension base="xs:double">

"simpleType" explanation[:-)]: you're extending (rather than restricting)
the double simpleType into simpleContent.

HTH,

Pete.
--
=============================================
Pete Cordell
for XML to C++ data binding visit
http://www.tech-know-ware.com/lmx
(or http://www.xml2cpp.com)
=============================================

----- Original Message ----- 
From: "Jon Berndt" <jsb@hal-pc.org>
To: <xmlschema-dev@w3.org>
Sent: Friday, November 25, 2005 5:23 PM
Subject: Attributes, simpleContent, etc.


>
> I am just beginning to work with schemas. I'm having a little trouble
> authoring a schema.
> (I'm using the oXygenXML editor, if that matters). If there is a better
> place for me to
> post this, please let me know.
>
> I have an element in my XML document that looks as follows:
>
> <wingarea unit="FT2"> 174.0 </wingarea>
>
> The element is required, the content must be greater than 0, and the unit
> can be one of
> FT2 or M2 (the unit is optional, with FT2 being the default). I've read up
> on this, but so
> far I've been unsuccessful at making the correct schema, according to the
> oXygen XML error
> messages I get.
>
> Here's what I've got so far:
>
>  <xs:element name="wingarea">
>    <xs:complexType>
>      <xs:simpleContent>
>        <xs:restriction base="xs:double">
>          <xs:minExclusive value="0"/>
>          <xs:attribute name="unit" use="optional" default="FT2">
>            <xs:simpleType>
>              <xs:restriction base="xs:string">
>                <xs:enumeration value="M2"/>
>                <xs:enumeration value="FT2"/>
>              </xs:restriction>
>            </xs:simpleType>
>          </xs:attribute>
>        </xs:restriction>
>      </xs:simpleContent>
>    </xs:complexType>
>  </xs:element>
>
> I get an error message when I try and validate a document using this
> schema:
>
> --- start error message ---
>
> "Complex Type Definition Representation Error for type
> '#AnonType_wingarea'.  When
> <simpleContent> is used, the base type must be a complexType whose content
> type is simple,
> or, only if restriction is specified, a complex type with mixed content
> and emptiable
> particle, or, only if extension is specified, a simple type. 'double'
> satisfies none of
> these conditions. URL: http://www.w3.org/TR/xmlschema-1/#src-ct"
>
> --- end error message ---
>
> I'd be grateful if someone can give me a "simpleType" of explanation of
> where I've gone
> wrong! Thanks.
>
> Jon Berndt
> League City, TX
>
>
>
>
Received on Sunday, 27 November 2005 10:05:52 GMT

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