Re: [xml-dev] XML schema - multiple import of module

[Lech Rzedzicki <xchaotic@gmail.com>]

The problem is bigger than you think, and quite honestly is more
conceptual that technical.
I would suggest separate schemas for main content and law extracts and
using NVDL for dispatching to a relevant schema.
In main.xsd allow for any elements from the 'law' namespace and it
should work fine.

In your case, I think the duplication occurs when you import both the
law and the struct into main as they both define title and p elements,
if you can avid that, you should be fine as well.

If you're still stuck with the problem, please contact me off-list and
I'll send you some samples of how I handled the exact same situation
in the past.

Lech

On Thu, Jun 4, 2009 at 5:35 PM, DUNN, Mark <mark.dunn@oup.com> wrote:
> Hello,
>
> I'm new to XML Schemas, and investigating conversion of a DTD to an XML
> Schema. I have a problem describing the Schema version of the following
> structure:
>
> <doc>
>  <div>
>  <title>Section 1</title>
>  <p>Some text...</p>
>  <p>
>   <law:extraxt>
>    <title>Title of Regulation</title>
>    <p>Text of regulation</p>
>   </law:extract>
>  </p>
>  </div>
> </doc>
>
>
> The problem is in the non-namespaced <title> and <p> elements occurring
> within the namespaced <law:extract> element. They are the same as the
> ones occurring outside this element, so I'd like to define them only
> once.
>
> My attempt at expressing this structure uses three .xsd files:
>
> main.xsd:
>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> xmlns="http://xsd.oup.com/ac-xsd/";
> xmlns:law="http://xsd.oup.com/ac-law/";
> targetNamespace="http://xsd.oup.com/ac-xsd/";
> elementFormDefault="qualified">
>        <xs:redefine schemaLocation="struct.xsd">
>                <xs:group name="paragraph-content">
>                        <xs:choice>
>                                <xs:group ref="paragraph-content"/>
>                                <xs:element ref="law:extract"/>
>                        </xs:choice>
>                </xs:group>
>        </xs:redefine>
>        <xs:import namespace="http://xsd.oup.com/ac-law/";
> schemaLocation="law.xsd"></xs:import>
>        ...
> </xs:schema>
>
> law.xsd:
>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> elementFormDefault="qualified"
> targetNamespace="http://xsd.oup.com/ac-law/";
> xmlns:law="http://xsd.oup.com/ac-law/";
> xmlns:struct="http://xsd.oup.com/ac-xsd/";>
>        <xs:import schemaLocation="struct.xsd"
> namespace="http://xsd.oup.com/ac-xsd/";></xs:import>
>        <xs:element name="extract">
>                <xs:complexType>
>                        <xs:sequence>
>                                <xs:element ref="struct:title"
> minOccurs="0"/>
>                                <xs:element ref="struct:p"
> minOccurs="1"/>
>                        </xs:sequence>
>                </xs:complexType>
>        </xs:element>
>        ...
> </xs:schema>
>
>
> struct.xsd:
>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> elementFormDefault="qualified" attributeFormDefault="unqualified"
> targetNamespace="http://xsd.oup.com/ac-xsd/";
> xmlns="http://xsd.oup.com/ac-xsd/";>
>        <xs:group name="general-inline">
>                <xs:choice>
>                        <xs:element ref="b"/>
>                        <xs:element ref="i"/>
>                </xs:choice>
>        </xs:group>
>        <xs:group name="paragraph-content">
>                <xs:choice>
>                        <xs:group ref="general-inline"></xs:group>
>                        <!-- ... [plus others] ... --->
>                </xs:choice>
>        </xs:group>
>        <xs:element name="p">
>                <xs:complexType mixed="true">
>                        <xs:choice minOccurs="0" maxOccurs="unbounded">
>                                <xs:group ref="paragraph-content"/>
>                        </xs:choice>
>                </xs:complexType>
>        </xs:element>
>        ...
> </xs:schema>
>
>
> When I try saving the schema files in XMLSpy 2009, I get an error saying
> that <title> is already declared, presumably because the file struct.xsd
> has ben imported twice.
>
> The W3C spec says that importing twice is legitimate, but vendors are
> encouraged to raise it as an error. Fair enough - I don't like the
> circularity in my description.
>
> But the structure itself seems reasonable, I just can't see a way of
> expressing it in XML Schema.
>
> Can anyone help?
>
>
> Kind regards,
>
> Mark Dunn
> XML Data Engineer
> Oxford University Press
>
> Oxford University Press (UK) Disclaimer
>
> This message is confidential. You should not copy it or disclose its contents to anyone. You may use and apply the information for the intended purpose only. OUP does not accept legal responsibility for the contents of this message. Any views or opinions presented are those of the author only and not of OUP. If this email has come to you in error, please delete it, along with any attachments. Please note that OUP may intercept incoming and outgoing email communications.
>
> _______________________________________________________________________
>
> XML-DEV is a publicly archived, unmoderated list hosted by OASIS
> to support XML implementation and development. To minimize
> spam in the archives, you must subscribe before posting.
>
> [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/
> Or unsubscribe: xml-dev-unsubscribe@lists.xml.org
> subscribe: xml-dev-subscribe@lists.xml.org
> List archive: http://lists.xml.org/archives/xml-dev/
> List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
>
>