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Hi Folks,
Has anyone looked at this Namespace-based Validation Dispatching Language?
I am not sure that I understand what problem it is solving. In one of
Murata's Powerpoint documents[1] on NVDL he has these two slides:
--------------------------------
Requirements on validation#1
- It should be possible to combine schemas representing vocabularies easily.
- It should be possible to divide non-monolithic documents into pieces and
then validate each piece against one of the schemas. (divide-and-validate)
Do existing schema languages meet these requirements?
- No, you have to understand all schemas very well and change them.
- No, you have to validate the entire document against the combination of
all schemas.
--------------------------------
How do you interpret these 2 slides?
Suppose that an XML Schema declares this Book element:
targetNamespace="http://www.books.org";
<element name="Book">
<complexType>
<sequence>
<element name="Title" type="string"/>
<element name="Author" type="string"/>
<element name="Date" type="string"/>
<element name="ISBN" type="string"/>
<element name="Publisher" type="string"/>
</sequence>
</complexType>
</element>
Then, an instance document would look like this:
<Book xmlns="http://www.books.org";>
<Title>The First and Last Freedom</Title>
<Author>J. Krishnamurti</Author>
<Date>1954</Date>
<ISBN>0-06-064831-7</ISBN>
<Publisher>Harper & Row</Publisher>
</Book>
I interpret Murata's slides as saying that with NVDL you can insert elements
from another namespace into the <Book>...</Book> element. For example, here
I insert some XHTML elements:
<Book xmlns="http://www.books.org";>
<Title>The First and Last Freedom</Title>
<HTML xmlns="http://www.w3.org/TR/REC-xhtml";>
<BODY>Hello World</BODY>
</HTML>
<Author>J. Krishnamurti</Author>
<Date>1954</Date>
<ISBN>0-06-064831-7</ISBN>
<Publisher>Harper & Row</Publisher>
</Book>
And the NVDL Processor will sort out the two components (the Book component
and the HTML component) and validate each individually.
Normally, with the above instance document a schema validator would
complain, saying that "the HTML element is unexpected, Expecting the Author
element".
So, what does this "component insertion" capability buy me? Murata calls
this a "compound document". What exactly is a "compound document"? /Roger
[1] http://www.asahi-net.or.jp/~eb2m-mrt/svgopen/200409SVGOpen.ppt
-----Original Message-----
From: MURATA Makoto [mailto:murata@hokkaido.email.ne.jp]
Sent: Sunday, January 16, 2005 12:05 PM
To: xml-dev@lists.xml.org
Subject: [xml-dev] Announcement of the NVDL FCD
Dear colleagues,
Let me announce the final committee draft of Namespace-based
Validation Dispatching Language (ISO/IEC FCD 19757-4). NVDL is a
language for dividing a multi-namespace document into single-namespace
fragments and then invoke validators for these fragments. The main
target of this language is a composite XML document that combines
multiple formats, such as XHTML, SVG, SMIL and XForms.
This language has several ancestors: RELAX Namespace (JIS TR and
ISO/IEC DTR), Modular Namespaces (James Clark), Namespace Switchboard
(Rick Jelliffe), and Namespace Routing Language (James Clark). NRL
is the closest ancestor.
ISO/IEC FCD 19757-4 is available at:
http://www.jtc1sc34.org/repository/0586.pdf
http://www.asahi-net.or.jp/~eb2m-mrt/dsdl/
Here are some pointers to talks about NVDL.
- Opening keynote speech for SVG Open 2004 (MURATA Makoto)
http://www.asahi-net.or.jp/~eb2m-mrt/svgopen/
- Namespace Routing Language (James Clark)
http://www.thaiopensource.com/relaxng/nrl.html
- XML 2003 session report: Namespace Routing Language (Uche Ogbuji)
http://www.xmlhack.com/read.php?item=2125
- Combining multiple vocabularies (MURATA Makoto)
http://www.idealliance.org/proceedings/xml03/slides/murata/murata.ppt
- XML 2003 session report: Combining multiple vocabularies
without tears (Uche Ogbuji)
http://xmlhack.com/read.php?item=2123
Cheers,
--
MURATA Makoto <murata@hokkaido.email.ne.jp>
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