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RE: Need help with Unique Particle Attribution Rule

From: Michael Kay <mike@saxonica.com>
Date: Fri, 7 Jan 2005 14:11:31 -0000
To: "'Vinotha Suntharalingam'" <vinos@carbontwelve.com>, <xmlschema-dev@w3.org>
Message-Id: <E1Cmupz-0000LT-00@ukmail1.eechost.net>
This is actually one of those examples where the Thompson/Tobin algorithm
used by XSV and Saxon doesn't give a UPA error, because the two particles
for element "error" both refer to the same element declaration. The
Thompson/Tobin algorithm lets a content model through if the element
declaration for each element can be determined unambiguously, even if the
particle can't.
 
I think the following content model is equivalent, and passes the stricter
version of the UPA test:
 
<xsd:element name="systemProvider">
    <xsd:complexType>
        <xsd:sequence>
            <xsd:sequence minOccurs="0" maxOccurs="unbounded">
                <xsd:element ref="admin"/>
                <xsd:element ref="error" minOccurs="0"/>
            </xsd:sequence>
            <xsd:sequence minOccurs="0">
               <xsd:element ref="deviceTypeInfo" maxOccurs="unbounded"/>
               <xsd:element ref="error" minOccurs="0"/>
            </xsd:sequence>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>
 
Michael Kay
http://www.saxonica.com/


  _____  

From: xmlschema-dev-request@w3.org [mailto:xmlschema-dev-request@w3.org] On
Behalf Of Vinotha Suntharalingam
Sent: 07 January 2005 05:33
To: xmlschema-dev@w3.org
Subject: Need help with Unique Particle Attribution Rule



Hi,

I'm trying to parse an xsd with Xerces and I'm running into UPA rule
violation problems. Attached below is relevant sections in the xsd where the
problem is encountered. I'm finding it difficult to define the
'systemProvider' element in such way it doesn't violate this rule. Could
someone please assist me on how it can be done? 

(I tried to follow the name, first-name, last-name example to fix the
problem, but this particular element definition seems to be a bit more
complicated. Any help would be much appreciated.)

<xsd:element name="systemProvider">
    <xsd:complexType>
        <xsd:sequence>
            <xsd:sequence minOccurs="0" maxOccurs="unbounded">
                <xsd:element ref="admin"/>
                <xsd:element ref="error" minOccurs="0"/>
            </xsd:sequence>
            <xsd:element ref="deviceTypeInfo" minOccurs="0"
maxOccurs="unbounded"/>
            <xsd:element ref="error" minOccurs="0"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>

<!-- The following elements are referenced in the above piece of code -->


<xsd:element name="deviceTypeInfo">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element ref="deviceType"/>
    <xsd:element ref="category"/>
    <xsd:element ref="maxPorts"/>
    <xsd:element ref="protocolSupported" maxOccurs="unbounded"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>
 
<xsd:element name="protocolSupported">
  <xsd:complexType>
   <xsd:simpleContent>
    <xsd:extension base="xsd:string">
     <xsd:attribute name="default" use="optional">
      <xsd:simpleType>
       <xsd:restriction base="xsd:string">
        <xsd:enumeration value="true"/>
       </xsd:restriction>
      </xsd:simpleType>
     </xsd:attribute>
    </xsd:extension>
   </xsd:simpleContent>
  </xsd:complexType>
 </xsd:element>
 
<xsd:element name="error">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element ref="id"/>
    <xsd:element ref="summary"/>
    <xsd:element ref="detail" minOccurs="0"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>
<xsd:element name="admin">
  <xsd:complexType>
   <xsd:sequence>
    <xsd:element ref="userId"/>
    <xsd:element ref="password" minOccurs="0"/>
    <xsd:element ref="userName" minOccurs="0"/>
   </xsd:sequence>
  </xsd:complexType>
 </xsd:element>

<xsd:element name="summary" type="xsd:string"/>
<xsd:element name="id" type="xsd:string"/>
<xsd:element name="detail" type="xsd:string"/>
<xsd:element name="userId" type="xsd:string"/>
<xsd:element name="password" type="xsd:string"/>
<xsd:element name="userName" type="xsd:string"/>
<xsd:element name="deviceType" type="xsd:string"/>
<xsd:element name="category" type="xsd:string"/>
<xsd:element name="maxPorts" type="xsd:string"/>


Thank you in advance.
Vino 
Received on Friday, 7 January 2005 14:11:37 GMT

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