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
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