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Lee HumphriesSubject: SS4.5 103k Bug: DTD to XSD wizard makes bad schema
Author: Lee Humphries
Date: 24 Nov 2002 09:59 PM
The attached DTD when run through the DTD to XSD wizard generates an XSD schema that fails validation - specifically the Unique Particle Attribution rule.


DocumentTree(1).dtd


DocumentTree(1).xsd
The resultant XSD that fails validation
Postnext
Ivan PedruzziSubject: RE: SS4.5 103k Bug: DTD to XSD wizard makes bad schema
Author: Ivan Pedruzzi
Date: 24 Nov 2002 11:29 PM
Lee,
My understanding is that your DTD can't be mapped to xsd (1:1)
The following should be a reasonable solution

{?xml version="1.0"?}
{xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"}
{xsd:element name="Leaf" type="xsd:string"/}
{xsd:element name="Flower" type="xsd:string"/}
{xsd:element name="Branch"}
{xsd:complexType}
{xsd:sequence}
{xsd:choice}
{xsd:element ref="Leaf"/}
{xsd:element ref="Flower"/}
{/xsd:choice}
{xsd:sequence}
{xsd:element ref="Leaf"/}
{xsd:element ref="Flower"/}
{/xsd:sequence}
{/xsd:sequence}
{/xsd:complexType}
{/xsd:element}
{xsd:element name="Root"}
{xsd:complexType}
{xsd:sequence maxOccurs="unbounded"}
{xsd:element ref="Branch"/}
{/xsd:sequence}
{/xsd:complexType}
{/xsd:element}
{/xsd:schema}

Ivan

> -----Original Message-----
> From: stylus-studio-tech Listmanager [mailto:listmanager]
> Sent: Sunday, November 24, 2002 10:16 PM
> To: Recipients of 'stylus-studio-tech' suppressed
> Subject: SS4.5 103k Bug: DTD to XSD wizard makes bad schema
>
>
> From: "Lee Humphries"
>
> The attached DTD when run through the DTD to XSD wizard
> generates an XSD schema that fails validation - specifically
> the Unique Particle Attribution rule.
>
>
>
> To reply: mailto:stylus-studio-tech.6051@edn.exln.com
> To start a new topic: mailto:stylus-studio-tech@edn.exln.com
> To login: http://edn.exln.com/~SSDN
>
>

Postnext
Lee HumphriesSubject: RE: SS4.5 103k Bug: DTD to XSD wizard makes bad schema
Author: Lee Humphries
Date: 25 Nov 2002 12:42 AM
Sorry Ivan, not even close.
What you've written is effectively:
((Leaf | Flower), Leaf, Flower)
Whereas I'm wanting:
(Leaf | Flower | (Leaf, Flower))
i.e. Leaf or Flower or both

Peculiarly this seems to be something very difficult to do with XML schemas, even though it's dead easy with DTDs. That was why I was trying your DTD to XSD wizard.

I've checked the standard and the construct the Wizard generated very definitely violates the Unique Particle Attribution rule. But what I find odd is that it's the rule itself that seems to have the bug. http://www.w3.org/TR/xmlschema-1/#non-ambig
"A content model will violate the unique attribution constraint if it contains two particles which ˇoverlapˇ and which either
are both in the {particles} of a choice or all group "
Postnext
Ivan PedruzziSubject: RE: SS4.5 103k Bug: DTD to XSD wizard makes bad schema
Author: Ivan Pedruzzi
Date: 25 Nov 2002 01:59 AM

Yes you are absolutely right.
This one is the closest definition I can think.

{xsd:element name="Branch"}
{xsd:complexType}>
{xsd:sequence}
{xsd:element ref="Leaf" minOccurs="0"/}
{xsd:element ref="Flower" minOccurs="0"/}
{/xsd:sequence}
{/xsd:complexType}
{/xsd:element}

It validates Leaf or Flower or both but also an empty content.
May be someone will come out with a better idea.

Ivan


> -----Original Message-----
> From: stylus-studio-tech Listmanager [mailto:listmanager]
> Sent: Monday, November 25, 2002 12:59 AM
> To: Recipients of 'stylus-studio-tech' suppressed
> Subject: RE: SS4.5 103k Bug: DTD to XSD wizard makes bad schema
>
>
> From: "Lee Humphries"
>
> Sorry Ivan, not even close.
> What you've written is effectively:
> ((Leaf | Flower), Leaf, Flower)
> Whereas I'm wanting:
> (Leaf | Flower | (Leaf, Flower))
> i.e. Leaf or Flower or both
>
> Peculiarly this seems to be something very difficult to do
> with XML schemas, even though it's dead easy with DTDs. That
> was why I was trying your DTD to XSD wizard.
>
> I've checked the standard and the construct the Wizard
> generated very definitely violates the Unique Particle
> Attribution rule. But what I find odd is that it's the rule
> itself that seems to have the bug.
> http://www.w3.org/TR/xmlschema-1/#non-ambig
> "A content model
> will violate the unique attribution constraint if it contains
> two particles which .overlap. and which either
> are both in the {particles} of a choice or all group "
>
>
>
> To reply: mailto:stylus-studio-tech.6053@edn.exln.com
> To start a new topic: mailto:stylus-studio-tech@edn.exln.com
> To login: http://edn.exln.com/~SSDN
>
>

Postnext
Lee HumphriesSubject: RE: SS4.5 103k Bug: DTD to XSD wizard makes bad schema
Author: Lee Humphries
Date: 25 Nov 2002 06:27 PM
Hi Ivan,

I've received some advice that
(Leaf | Flower (Leaf, Flower))
is actually bad DTD, and
((Leaf, Flower?) | Flower)
is much better. I tried this and it worked after converting to XSD.

However, I also tried
(Leaf | (Leaf? | Flower))
and converted that to an XSD and I still got a Unique Particle Attribution rule failure.

Any ideas why there's a difference?

Regards, Lee
Posttop
Ivan PedruzziSubject: RE: SS4.5 103k Bug: DTD to XSD wizard makes bad schema
Author: Ivan Pedruzzi
Date: 26 Nov 2002 11:36 AM
Lee,

After discussing with Alby, this is what I believe is happening

1) it validates

When the validator encounter "Leaf" it knows that it could find
"Flower" too.
The presence of "Leaf" is not ambiguous






minOccurs="0"/>






2) it doesn't validate

When the validator encounter "Leaf" it can not determine what
branch of choice to pick
The presence of "Leaf" is ambiguous







minOccurs="0"/>





Ivan






> -----Original Message-----
> From: stylus-studio-tech Listmanager [mailto:listmanager]
> Sent: Monday, November 25, 2002 6:44 PM
> To: Recipients of 'stylus-studio-tech' suppressed
> Subject: RE: SS4.5 103k Bug: DTD to XSD wizard makes bad schema
>
>
> From: "Lee Humphries"
>
> Hi Ivan,
>
> I've received some advice that
> (Leaf | Flower (Leaf, Flower))
> is actually bad DTD, and
> ((Leaf, Flower?) | Flower)
> is much better. I tried this and it worked after converting to XSD.
>
> However, I also tried
> (Leaf | (Leaf? | Flower))
> and converted that to an XSD and I still got a Unique
> Particle Attribution rule failure.
>
> Any ideas why there's a difference?
>
> Regards, Lee
>
>
>
> To reply: mailto:stylus-studio-tech.6057@edn.exln.com
> To start a new topic: mailto:stylus-studio-tech@edn.exln.com
> To login: http://edn.exln.com/~SSDN
>
>

   
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