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Re: DTD to Scheme

2005-02-02 01:31:27
In general UPA violations are easily solved if you rewrite the ambiguous model in a non ambiguous way. In your case

<!ELEMENT item (risid,(waiting|passing|(waiting,passing)))>

can be written as

<!ELEMENT item (risid,((waiting, passing?)|passing))>

and the corresponding schema will be valid.


Hope that helps,
George
---------------------------------------------------------------------
George Cristian Bina
<oXygen/> XML Editor, Schema Editor and XSLT Editor/Debugger
http://www.oxygenxml.com


Stano Paska wrote:
Hi,

I need rewrite som DTD into XML Schema.
I have problem with one part.
In element "item" there may be three combinations of waiting/passing
elements:
one waiting, one passing, or both.

In DTD it is easy and it works:
<!ELEMENT item (risid,(waiting|passing|(waiting,passing)))>

In Scheme it is easy, but it does not work:
    <xsd:element name="item">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element ref="risid"/>
                <xsd:choice>
                    <xsd:element ref="waiting"/>
                    <xsd:element ref="passing"/>
                    <xsd:sequence>
                        <xsd:element ref="waiting"/>
                        <xsd:element ref="passing"/>
                    </xsd:sequence>
                </xsd:choice>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>

:0,0: Complex type 'C0' violates the Unique Particle Attribution rule in
its components 'waiting' and 'waiting'

It is possible to write corresponding schema?

Thanks for your solutions.

Stano.

Attachments:
-----------------
test.xml
-----------------
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE result SYSTEM "d:\praca\lucia\klient\dtd.dtd">
<result>
    <item>
        <risid>DE307001001223</risid>
        <waiting>
            <average>13.99</average>
            <deviation>6.27</deviation>
            <count>4</count>
        </waiting>
        <passing>
            <average>13.99</average>
            <deviation>6.27</deviation>
            <count>4</count>
        </passing>
    </item>
</result>

----------------
DTD
----------------
<?xml version="1.0" encoding="UTF-8"?>

<!ELEMENT result (item+|error)>

<!ELEMENT error (#PCDATA)>
<!ELEMENT item (risid,(waiting|passing|(waiting,passing)))>

<!ELEMENT risid (#PCDATA)>
<!ELEMENT waiting (average,deviation,count)>
<!ELEMENT passing (average,deviation,count)>

<!ELEMENT average (#PCDATA)>
<!ELEMENT deviation (#PCDATA)>
<!ELEMENT count (#PCDATA)>

-----------------
Scheme
-----------------
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema";>

    <!-- simple elements -->
    <xsd:element name="risid" type="xsd:string"/>
    <xsd:element name="average" type="xsd:decimal"/>
    <xsd:element name="deviation" type="xsd:decimal"/>
    <xsd:element name="count" type="xsd:nonNegativeInteger"/>
    <xsd:element name="error" type="xsd:string"/>

    <!-- complex elements -->
    <xsd:complexType name="record">
        <xsd:sequence>
            <xsd:element ref="average"/>
            <xsd:element ref="deviation"/>
            <xsd:element ref="count"/>
        </xsd:sequence>
    </xsd:complexType>
    <xsd:element name="waiting" type="record"/>
    <xsd:element name="passing" type="record"/>

    <xsd:element name="item">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element ref="risid"/>
                <xsd:choice>
                    <xsd:element ref="waiting"/>
                    <xsd:element ref="passing"/>
                    <xsd:sequence>
                        <xsd:element ref="waiting"/>
                        <xsd:element ref="passing"/>
                    </xsd:sequence>
                </xsd:choice>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>

    <xsd:element name="result">
        <xsd:complexType>
            <xsd:choice>
                <xsd:element ref="error"/>
                <xsd:element ref="item" maxOccurs="unbounded"/>
            </xsd:choice>
        </xsd:complexType>
    </xsd:element>

</xsd:schema>



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