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Subject: RE: [xdi] Groups - draft-xdi-metaschema-v2.xsd uploaded
Sorry for the bad syntax and aborted sentence ending in "broader". I was so excited to see how clearly Drummond's proposed syntax become in RelaxNG that I hit send before I had actually finished it. The sentence I didn't finish was going to talk about how RelaxNG is part of a framework called DSDL that includes the ability to validate documents in a number of ways. For XDI, I suspect anything beyond RelaxNG is overkill (perhaps the use of Schematron would be beneficial too, however - http://www.schematron.com). More info on DSDL can be found at http://www.dsdl.org -Gabe __________________________________________________ gwachob@visa.com Chief Systems Architect Technology Strategies and Standards Visa International Phone: +1.650.432.3696 Fax: +1.650.554.6817 > -----Original Message----- > From: Wachob, Gabe > Sent: Tuesday, June 15, 2004 2:56 PM > To: drummond.reed@cordance.net; xdi@lists.oasis-open.org > Subject: RE: [xdi] Groups - draft-xdi-metaschema-v2.xsd uploaded > > > Just FYI- > I find using XML Schema to be real pain since it > basically requires you to use a tool (e.g. XMLSpy) to get a > good grasp on what the document the XML Schema is defining. > I'm finding myself using RelaxNG schema Compact Syntax > to be MUCH more expressive, easier to create (no tool needed) > and a TON easier to discuss. RelaxNG is more pattern based, > rather than object-based and seems to be more natural to use > when discussing document structure, as we are doing here. > RelaxNG has a XML syntax (just as W3C XML Schema has an XML > syntax), but RelaxNG also has a really straightforward, > human-read/writeable compact syntax that I use frequently. > The XML and compact syntaxes are isomorphic and there are a > number of tools to convert. > > http://relaxng.org > > http://relaxng.org/compact-tutorial-20030326.html > > One thing I had to get in my head, though, is that > RelaxNG defines the correct structure of a document, like a > DTD, rather than the elements in a namespace, like XML > Schema. That means, for example, that RelaxNG schema define a > "root" element for XML documents. XML Schema just define a > bunch of elements, any of which could be the root of a > document. When you validate a document against RelaxNG, you > are taking the outer XML element and matching it with the > RelaxNG's "start" production. When you validate a document > against XML Schema, you are taking the outer element and > trying to find it in the namespace defined by the XML Schema > documents you happen to have. A different mentality. Also, > RelaxNG is part of the DSDL framework which allows for a broader > > You can almost always mechanically convert a RelaxNG > schema into a WXS schema (but not the other way around). A > bunch of other nice things too with RelaxNG. > > Here's Drummond's latest XSD in relaxng. Note how much > simpler it is ;-) > > ===== > > default namespace="http://xdi.oasis-open.org" > start=Resource > > anyelement = (element * { (attribute * {text} | text | > anyelement) * }) > > RefContent= element note {xsd:string} *, > element xri {xsd:string} +, > element data { anyelement *} ?, > Resource *, > Link *, > anyelement * > > Resource = element resource {RefContent} > Link = element link {RefContent} > > ====== > > *AND* (the final kicker), RelaxNG was originally > developed in OASIS ;-) > > > __________________________________________________ > gwachob@visa.com > Chief Systems Architect > Technology Strategies and Standards > Visa International > Phone: +1.650.432.3696 Fax: +1.650.554.6817 > > > > -----Original Message----- > > From: drummond.reed@cordance.net [mailto:drummond.reed@cordance.net] > > Sent: Tuesday, June 15, 2004 2:13 PM > > To: xdi@lists.oasis-open.org > > Subject: [xdi] Groups - draft-xdi-metaschema-v2.xsd uploaded > > > > > > The document draft-xdi-metaschema-v2.xsd has been submitted > > by Drummond Reed (drummond.reed@cordance.net) to the OASIS > > XRI Data Interchange (XDI) TC document repository. > > > > Document Description: > > v2 of the proposed XDI metaschema (the only change being a > > Notes element for adding annotations to an XDI document) > > > > Download Document: > > http://www.oasis-open.org/apps/org/workgroup/xdi/download.php/ > > 7277/draft-xdi-metaschema-v2.xsd > > > > View Document Details: > > http://www.oasis-open.org/apps/org/workgroup/xdi/document.php? > > document_id=7277 > > > > > > PLEASE NOTE: If the above links do not work for you, your > > email application > > may be breaking the link into two pieces. You may be able to > > copy and paste > > the entire link address into the address field of your web browser. > > > > >
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