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Re: Problem in writing schema

From: Morris Matsa <mmatsa@us.ibm.com>
Date: Tue, 8 Jan 2002 10:41:37 -0500
To: "Seema" <2kseema@sun20.datamatics.com>
Cc: <xmlschema-dev@w3.org>
Message-ID: <OF28444995.EC0358B3-ON85256B3B.00556047@pok.ibm.com>


maxOccurs="1" is the default so that doesn't change anything.  What you
were saying is "each time through the choice make sure that the Mandatory
element appears exactly once."  So it was ok for it to then appear again
the next time through the choice, another exactly once.  I don't know what
the best way to accomplish your goal is, but I think this should work:

<xsd:complexType name="FormType">
 <xsd:sequence>
  <xsd:choice minOccurs="0"  maxOccurs="unbounded">
     <xsd:element name="TextBox" type="TextBoxType" />
     <xsd:element name="TextArea" type="TextAreaType"  />
     <xsd:element name="Header"  type="HeaderType"/>
     <xsd:element name="RadioButton" type="RadioButtonType" />
     <xsd:element name="SelectList" type="SelectListType"  />
  </xsd:choice>
  <xsd:choice>
     <xsd:element name="Mandatory"  type="EmptyType" />
     <xsd:element name="Optional"  type="EmptyType" />
  </xsd:choice>
  <xsd:choice minOccurs="0"  maxOccurs="unbounded">
     <xsd:element name="TextBox" type="TextBoxType" />
     <xsd:element name="TextArea" type="TextAreaType"  />
     <xsd:element name="Header"  type="HeaderType"/>
     <xsd:element name="RadioButton" type="RadioButtonType" />
     <xsd:element name="SelectList" type="SelectListType"  />
  </xsd:choice>
 </xsd:sequence>
</xsd:complexType>

You could also turn the repeated list of elements (TextBox, etc.) into a
model group.



"Seema" <2kseema@sun20.datamatics.com>@w3.org on 01/08/2002 07:52:38 AM

Sent by:    xmlschema-dev-request@w3.org


To:    <xmlschema-dev@w3.org>
cc:
Subject:    Problem in writing schema




Hi all,

I have a schema written for XML's that would  represent a Form in html. The
elements of the Form like textbox, textarea, etc  would appear any no. of
times in any order, however, there is a pair of tags,  namely
<Optional> and
<Mandatory>

Out of these only one of them may appear, at a time  in the form and only a
single instance might appear.
How do I tackle this.
My present schema handles it in the following way

<xsd:complexType name="FormType"  >

 <xsd:choice minOccurs="0" maxOccurs="1"  >
  <xsd:choice minOccurs="0"  maxOccurs="unbounded">
     <xsd:element  name="TextBox" type="TextBoxType" />
      <xsd:element name="TextArea" type="TextAreaType"  />
     <xsd:element name="Header"  type="HeaderType"/>
     <xsd:element  name="RadioButton" type="RadioButtonType" />
      <xsd:element name="SelectList" type="SelectListType"  />
     <xsd:element name="Mandatory"  type="EmptyType" maxOccurs="1"/>
    </xsd:choice>
   <xsd:choice minOccurs="0"  maxOccurs="unbounded">
     <xsd:element  name="TextBox" type="TextBoxType" />
      <xsd:element name="TextArea" type="TextAreaType"  />
     <xsd:element name="Header"  type="HeaderType"/>
     <xsd:element  name="RadioButton" type="RadioButtonType" />
      <xsd:element name="SelectList" type="SelectListType"  />
     <xsd:element name="Optional"  type="EmptyType" maxOccurs="1"/>
    </xsd:choice>
   </xsd:choice>
  </xsd:complexType>


However, the condition that only one occurence of  the tag (Optional or
Mandatory) should appear is not satisfied while validating  the XML with
the schema.
Please suggest a suitable solution.

Thanks in advance
Seema
Received on Tuesday, 8 January 2002 10:41:11 GMT

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