Re: Can XML namespaces get into a recursive loop?

You need to import the schemas, but circular imports are perfectly
acceptable to XSD.  The parser included with windows is called MSXML,
and it *does* support validation.  We had a bug in our managed .NET
validator such that in V1.0 and V1.1 we fail on circular imports, but
this is fixed in v2.0.  If you are using a validation engine that fails
on circular imports, it's a bug in the engine.  You could probably get
more information about which validators support circular imports
properly (most do, AFAIK) by asking on xml-dev.

Regards,
Joshua Allen=20

> -----Original Message-----
> From: XML technologies in the Java Platform=20
> [mailto:[email protected]] On Behalf Of Kar I
> Sent: Friday, March 26, 2004 12:20 AM
> To: [email protected]
> Subject: Can XML namespaces get into a recursive loop?
>=20
> Hi all,
> I am new to this discussion site. I have a question about=20
> using namespaces to define mutually define XML schemas.
> Take this example
> -----------author.xsd--------------
> <?xml version=3D"1.0"?>
> <xs:schema xmlns:xs=3D"http://www.w3.org/2001/XMLSchema"
> xmlns:bc=3D"book1.xsd"
> elementFormDefault=3D"qualified">
> <xs:element name=3D"author" type=3D"authorType"/>
>     <xs:complexType name=3D"authorType">
> <xs:sequence>
>  <xs:element ref=3D"bc:book"/>
> </xs:sequence>
> </xs:complexType>
> </xs:schema>
> --------------------------------------
> ---------book.xsd---------------------
> <?xml version=3D"1.0"?>
> <xs:schema xmlns:xs=3D"http://www.w3.org/2001/XMLSchema"
> xmlns:ac=3D"author1.xsd"
> elementFormDefault=3D"qualified">
> <xs:element name=3D"book" type=3D"bookType"/>
>=20
>     <xs:complexType name=3D"bookType">
>       <xs:sequence>
>  <xs:element ref=3D"ac:author"/>
>       </xs:sequence>
>     </xs:complexType>
>=20
>=20
> </xs:schema>
> ---------------------------------------
> As you can clearly see that each of these xml schemas use the=20
> other for their definition. I have tried using microsofts=20
> parser(WINXP) and it was only good at find out well=20
> formedness. Then i downloaded Sun Multi-Schema XML Validator,=20
> It performed more predictably, but always pointed the fault=20
> at my xml file, expecting the deeper tag in the recursion.
> My question is: Is this a potential flaw in the XSD spec? As=20
> there will always be a possibility that a validator/XML=20
> engine will get into an infinite loop with this?
>=20
> I look forward to your expert comments !!
>=20
>=20
> Thanks
> Karthik
>=20
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> xml-interest: A list for discussing XML technologies in the=20
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>=20

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