Cart
[Home] [By Thread] [By Date] [Recent Entries]
> Uche Ogbuji scripsit: > > > Simon has brought up the more > > practical geospatial example. But the folks who could clean up this mess > > mostly just take in all the warnings and blithely respond "sorry we had to > > satisfy OO and relational data type needs from our chartered requirements". > > Here's a sketch of a way through the problem. Define an (XML-based, > why not?) regex-based expression language for datatypes. Then write > interpreters for this language that export appropriate datatypes > to RELAX NG schema validators and other tools. > > <library uri="http://http://www.w3.org/2001/XMLSchema-datatypes"> > <datatype "boolean"> > <rule regex="true|1" value="true"/> > <rule regex="false|0" value="false"/> > </datatype> > <datatype "integer"> > <rule regex="+0" value="0"/> > <rule regex="-0" value="0"/> > <rule regex="0" value="0"/> > <rule regex="+0*([1-9][0-9]*)" value="\1"/> > <rule regex="-0*([1-9][0-9]*)" value="-\1"/> > <rule regex="0*([1-9][0-9]*)" value="\1"/> > </datatype> > </library> > > This syntax does not handle constraining facets yet; I leave it up > to someone else to figure out how to integrate these. The basic > questions "Is this string lexical?" and "Do these strings have strings the same > value?" are mapped to "Does this string match any regex?" and "When > mapped into the corresponding values, are these two strings identical?" I really like this, and it's something like what I've had in mind. Now I have to go sacrifice a newt to be granted the time to hack at it. I think combining this with Eric's XVIF, as Simon mentioned would also light the way to extending it into XPath, and from there so much else. > > And so the Titanic lumbers on. Nought but the iceberg itself will alter its > > course. > > Nevertheless some people may decide to get off the boat first. I'm on the little rubber dinghy with Fela blaring from the loudspeakers: "Shuffering and Shmiling" :-) -- Uche Ogbuji Fourthought, Inc. http://uche.ogbuji.net http://4Suite.org http://fourthought.com Track chair, XML/Web Services One Boston: http://www.xmlconference.com/ Basic XML and RDF techniques for knowledge management, Part 7 - http://www-106.ibm.com/developerworks/xml/library/x-think12.html Keeping pace with James Clark - http://www-106.ibm.com/developerworks/xml/library/x-jclark.html Python and XML development using 4Suite, Part 3: 4RDF - http://www-105.ibm.com/developerworks/education.nsf/xml-onlinecourse-bytitle/8A1EA5A2CF4621C386256BBB006F4CEC
|
