Re: Confusing XSD sequence/group.

From: Michael Kay <mike@saxonica.com>
To: xml-dev@lists.xml.org
Date: Sun, 19 Dec 2010 23:19:53 +0000

Play the video

Are you sure? When I run it (with Saxon 9.3.0.2) I get

Processing file:/e:/temp/test.xml
Validation error on line 3 column 15 of test.xml:
In content of element <MEMBER>: The content model does not allow element <STRING> to
appear here. No further elements are allowed at this position (See
http://www.w3.org/TR/xmlschema-1/#cvc-complex-type clause 2.4)

Michael Kay
Saxonica

On 19/12/2010 22:34, David Lee wrote:

001a01cb9fcc$d6ff2020$84fd6060$@calldei.com" type="cite">

I have an XSD with this group

<xsd:group name="value">
        <xsd:choice>
                <xsd:element name="STRING"/>
                <xsd:element name="NUMBER"/>
                <xsd:element name="NULL"/>
                <xsd:element name="OBJECT"/>
                <xsd:element name="ARRAY"/>

        </xsd:choice>
    </xsd:group>

I then use it in this element

<xsd:element name="MEMBER">
        <xsd:complexType>
            <xsd:sequence minOccurs="1" maxOccurs="1">
                <xsd:group ref="value" minOccurs="1" maxOccurs="1"/>
            </xsd:sequence>
            <xsd:attribute name="name" use="required"/>
        </xsd:complexType>
    </xsd:element>

----------------

I validate it against a document which has this fragment

<MEMBER name="_text">
      <STRING>        </STRING>
      <STRING>
        </STRING>                                          <STRING>
        </STRING>                                          <STRING>
        </STRING>                                          <STRING>
        </STRING>                                          <STRING>
        </STRING>                                          <STRING>
        </STRING>                                          <STRING>
        </STRING>                                          <STRING>
        </STRING>                                          <STRING>
        </STRING>                                          <STRING>
        </STRING>                                          <STRING>
    </STRING>

</MEMBER>

It validates as successful in every schema validator I've tried (including Saxon, XSV, MS XML).

What am I missing ???

I want to have MEBMER element contain One and Only One element of STRING|NUMBER|NULL|OBJECT|ARRAY

Thanks for any suggestions !

Here's the full schema

<?xml version="1.0"?>
<xsd:schema xmlns:xsd=http://www.w3.org/2001/XMLSchema>
    <xsd:element name="OBJECT">
        <xsd:complexType>
            <xsd:sequence minOccurs="0" maxOccurs="unbounded">
                <xsd:element name="MEMBER"/>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="MEMBER">
        <xsd:complexType>
            <xsd:sequence minOccurs="1" maxOccurs="1">
                <xsd:group ref="value" minOccurs="1" maxOccurs="1"/>
            </xsd:sequence>
            <xsd:attribute name="name" use="required"/>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="ARRAY">
        <xsd:complexType>
            <xsd:sequence maxOccurs="unbounded" minOccurs="0">
                <xsd:group ref="value"/>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="STRING">
        <xsd:simpleType>
            <xsd:restriction base="xsd:string"/>
        </xsd:simpleType>
    </xsd:element>
    <xsd:element name="NUMBER">
        <xsd:simpleType>

            <xsd:restriction base="xsd:double"/>

        </xsd:simpleType>
    </xsd:element>
    <xsd:element name="NULL"/>
    <xsd:group name="value">
        <xsd:choice>
                <xsd:element name="STRING"/>
                <xsd:element name="NUMBER"/>
                <xsd:element name="NULL"/>
                <xsd:element name="OBJECT"/>
                <xsd:element name="ARRAY"/>

        </xsd:choice>
    </xsd:group>

</xsd:schema>

----------------------------------------

David A. Lee

dlee@calldei.com

http://www.xmlsh.org

References:
- Confusing XSD sequence/group.
  - From: "David Lee" <dlee@calldei.com>

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