I'm assuming you are using the latest Xerces. XSDHandler is not intended to be used directly. This FAQ page [1] describes how to load and cache grammars. The Schema page [2] might be interesting to you too.
SchemaGrammar implements XSGrammar, which has a method "toXSModel" that converts a SchemaGrammar to org.apache.xerces.impl.xs.psvi.XSModel. XSModel has many methods to retrieve information about various components in your schema. You can get basically everything you had in your schema, including the data types of attributes. [1] http://xml.apache.org/xerces2-j/faq-grammars.html [2] http://xml.apache.org/xerces2-j/faq-xs.html Cheers, Sandy Gao Software Developer, IBM Canada (1-905) 413-3255 [EMAIL PROTECTED] [EMAIL PROTECTED] edu To: [EMAIL PROTECTED] cc: 11/05/2002 01:36 Subject: Accessing non-global attribute datatype information AM Please respond to xerces-j-user Hello I'm fairly new to the native interface and implementation APIs and have been having some difficulties. I have a schema we are using for the purpose of representing the semantics of a domain and also to validate whether fragments of non-xml text could be marked up as XML. When we are parsing the schema and storing the elements as Java objects in our data structure, I would like to be able to be able to capture the simple types as some Java object such as org.apache.xerces.impl.xs.DateDV and store that. 1) Is there a way to access this kind of attribute datatype information from a SchemaGrammar, or by using some other method than using SchemaGrammars? From what I can see, you can't access the datatype information of attributes and simple types that aren't globally declared using a SchemaGrammar, but maybe I'm missing something. It looks like this kind of information could be retrieved using xerces' dom's ASModel, but that is unfortuanately being deprecated. 2) If there isn't a way and I'm stuck with temporarily using ASModels, do you have any idea how much longer they'll be in existance? 3) I am also having my share of problems just getting the SchemaGrammar. I can get it using the DOMASModel, but getting it the straitforward way with the org.apache.xerces.impl.xs.traversers.XSDHandler, I end up getting null pointer exceptions after the parseSchema is called (no other other info from stacktrace besides that) .... String filename = "sample.xsd"; File schemaFile = new File(filename); Reader reader = new InputStreamReader(new FileInputStream(schemaFile)); XMLInputSource input = new XMLInputSource(null, filename, null); input.setCharacterStream(reader); XSDDescription descr = new XSDDescription(); descr.setTargetNamespace("http://www.oreilly.com/javaxml2";); descr.setLiteralSystemId(filename); descr.setContextType(descr.CONTEXT_PREPARSE); descr.setLocationHints( new String[] { filename } ); XSDHandler handler = new XSDHandler(new XSGrammarBucket()); SchemaGrammar gramm = handler.parseSchema(input, descr, new Hashtable ()); I have a feeling its my use of the XSDDescription thats at fault, because when I used another method on the XSDHandler that took the XSDDescription as an argument, I got a null ptr exception again. I tried about every permutation possible, setting or not setting various different system id's, which I don't entirely understand either (i.e. expanded, literal, base, all using the filename for the file in the pwd), as well as location hints and enclosing tag which I have a feeling I don't need. Any tips or sample code that could get me started with working with SchemaGrammars or XSDDescriptions correctly? Thank you in advance and sorry for the long letter, Eric Shell --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
