Well, I have a working example. Notes below. TOPIC: Datatype libraries in Relax NG DATE:2005-09-14T10:45:38 KEYWORDS:datatypes
* Using Relax NG with extension data types. Jing 20030619 used. Attempting to add a new data type to Jing, I tried out James example (sample/datatype/src/com/thaiopensource/datatype/sample/BalancedString.java). 1. in the datatype directory the datatype-sample.rng has the namespace incorrectly defined, presumably not updated. Should be <element name="balancedString" xmlns="http://relaxng.org/ns/structure/1.0"; datatypeLibrary="http://www.thaiopensource.com/relaxng/datatypes/sample";> <data type="balancedString"/> </element> That aside it ran and the valid.xml example parsed to the schema, using java -cp jing.jar;data-sample.jar \ com.thaiopensource.relaxng.util.Driver \ datatype-sample.rng valid.xml Trying to emulate this example I built a tiny Java file supposedly replicating BalancedString.java, using my own namespace etc. The points of note: 1. In the java file Declare the namespace to be used for the library private static final String DATATYPE_LIBRARY = "http://www.rnib.org/relaxng/datatype/units";; private static final String TYPE = "px"; This declares both the namespace and the actual datatype which will be declared in the schema file 2. In the Schema file <element name="unit" xmlns="http://relaxng.org/ns/structure/1.0"; datatypeLibrary="http://www.rnib.org/relaxng/datatype/units";> <data type="px"/> </element> Note the matching namespace and datatype. 3. Building the jar file. This is where I had fun. In sample/datatype/index.html James mentions com.thaiopensource.datatype.sample.SimpleDatatypeLibrary which is provided. What I found no mention of, was the Factory idea (of which I know little), yet which seems to provide the basic link between jing and the new datatype. In James file datatype-sample.jar, there exists a line -rw-rw-rw- 50 22-Sep-2001 11:10:46 \ META-INF/services/org.relaxng.datatype.DatatypeLibraryFactory which I found odd. Seemingly (and I'm guessing here, please tell me if I'm wrong), this file is generated and added to the jar to provide Jing with the list of classes which provide datatypes. So James example contains the line com.thaiopensource.datatype.sample.BalancedString which is the package name containing a class which implements the balancedString type. As often with James, nice and simple once understood. Bloody impossible until then! So I created a file META-INF\services\org.relaxng.datatype.DatatypeLibraryFactory with the single line org.rnib.datatype.units.Px after which the test I had generated ran perfectly. <doc> <unit>45px</unit> <unit>45 px</unit> <unit>.12 px</unit> </doc> The third example of unit fails with the error units.xml:6:20: error: bad character content for element Hope this helps others. regards DaveP ------------------------ Yahoo! Groups Sponsor --------------------~--> Most low income households are not online. Help bridge the digital divide today! http://us.click.yahoo.com/cd_AJB/QnQLAA/TtwFAA/2U_rlB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/rng-users/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
