RE: Schema Qs: Attributes and restrictions on xsd:patters

[Chudasama, Chetan]

Richard,

 

See my comments below. Hope it helps.

 

Cheers,

Chetan

-----Original Message-----
From: Richard Heintze [mailto:[EMAIL PROTECTED]
Sent: Monday, September 23, 2002 2:12 PM
To: [EMAIL PROTECTED]
Subject: Schema Qs: Attributes and restrictions on xsd:patters

(1) How can I check the syntax of an attribute? I want to say <call phone="303 444 2501"> check on bn book </call>. Can an attribute be a derived simple type? What is the syntax?
[Chudasama, Chetan] 

You can use simpleType's to derive attributes from. The XSD Specification is also clear on that. Thus you could define the call element as:

 

<xs:element name="call">

  <xs:complexType>

    <xs:attribute name="phone">

      <xs:simpleType>

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

          <xs:pattern value="\p{Nd}{3} \p{Nd}{3} \p{Nd}{4}( x \p{Nd}+)?"/>

        </xs:restriction>

      </xs:simpleType>

    </xs:attribute>

  </xs:complexType>

</xs:element> 

(2) How do I create an element like this <phone loc="home">303 444 2501</phone>?

Here is my attempt:

Why doesn't the latest xerces-J let me put an attribute on a derivation simple type?

  <xsd:simpleType name="phone_type">
    <xsd:restriction base="xsd:string">
      <xsd:pattern value="\p{Nd}{3} \p{Nd}{3} \p{Nd}{4}( x \p{Nd}+)?"/>
    </xsd:restriction>
    <xsd:attribute name="loc" type="xsd:string" use="optional"/>
  </xsd:simpleType>

[Error] phonelog.xsd:37:65: s4s-elt-must-match: The content of 'simpleType' must match (annotation?, (restriction | list | union)).
[Chudasama, Chetan] The error in this case is because you cannot use the element 'attribute' while defining a simpleType. A simpleType can only contain the following as its children:

0 or 1 annotation followed by exactly one of restriction, list or union as shown in the error.

I suggest you look at the W3C Schema part -0 which is a primer to get these basic concepts clear (http://www.w3.org/TR/xmlschema-0/). Also if you use some tools to create the Schema then you would be reducing such mistakes.

 

 

 

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