Hi Andy, Each SchemaGrammar is a container for all the schema components of a given target namespace. Includes have no representation in the model (though you can query [1] the grammar for the list of document URIs which contributed to it). All of the schema components constructed from the includes will be stored in the same grammar object.
Thanks. [1] http://xerces.apache.org/xerces2-j/javadocs/xs/org/apache/xerces/xs/XSNamespaceItem.html#getDocumentLocations() Michael Glavassevich XML Parser Development IBM Toronto Lab E-mail: [EMAIL PROTECTED] E-mail: [EMAIL PROTECTED] "Andy Harris" <[EMAIL PROTECTED]> wrote on 11/12/2007 12:04:51 AM: > Thanks for your response. How are includes represented in the grammar > pool? It would seem that included schemas - which all have the same > targetNamespace - would trigger these warnings. > > -----Original Message----- > From: Michael Glavassevich [mailto:[EMAIL PROTECTED] > Sent: Sunday, November 11, 2007 7:16 PM > To: j-users@xerces.apache.org > Cc: Andy Harris > Subject: Re: grammar pool population > > Hi Andy, > > You're right. This warning is generated when a grammar pool returns > multiple grammar objects for the same target namespace. Note that this > includes imports (each SchemaGrammar has a list of them which the schema > validator's grammar bucket [1] extracts), so if you loaded several > grammars > independently with different grammar pools and they had imports for the > same namespace you might run into this. If these grammar objects are > truly > equal I suppose you could resolve the conflict by replacing the > duplicates > with a unique instance or avoid the issue altogether by using a single > grammar pool for all of the schemas. > > Thanks. > > [1] > http://svn.apache.org/viewvc/xerces/java/trunk/src/org/apache/xerces/imp > l/xs/XSGrammarBucket.java?revision=446734&view=markup > > Michael Glavassevich > XML Parser Development > IBM Toronto Lab > E-mail: [EMAIL PROTECTED] > E-mail: [EMAIL PROTECTED] > > "Andy Harris" <[EMAIL PROTECTED]> wrote on 11/11/2007 08:49:17 > PM: > > > Hello- > > For performance reasons, I?m caching grammars for validation of an > > instance against a set of connected and disconnected schemas of an > > XBRL taxonomy. Schemas can be disconnected when discovered via > > linkbases. The only way I can get this working is to re-generate > > grammar every time, letting Xerces construct the pool before > > validating the instance. This is very expensive to let xerces parse > > grammar more then once. > > Searching the xerces-2 grammar FAQ and other mailing lists on the > > internet has suggestions on how to "actively" construct grammar > > pools (caching grammars), but I still get the following warning(s): > > Warning: > > One of the grammar(s) returned from the user's grammar pool is in > > conflict with another grammar. > > Here is my integration code for building a grammar pool from 2 or > > more root schemas: > > while (schemas.hasNext()) { > > IDTSNode schemaNode = (IDTSNode) schemas.next(); > > XMLGrammarPoolImpl gp = (XMLGrammarPoolImpl)schemaNode. > > getGrammarPool(); > > Grammar[] g = gp.retrieveInitialGrammarSet("http://www. > > w3.org/2001/XMLSchema"); > > > grammarPool.cacheGrammars("http://www.w3.org/2001/XMLSchema";, > g); > > } > > A root schema does not have any referencing schemas and the set of > > schemas are reverse topologically sorted. Inspection of the graph of > > grammars within grammarPool reveals that they are the same as when > > Xerces populates the grammar pool. Is this the correct way to cache > > grammars into the grammar pool? > > If there is only 1 root schema, there is no additional ?merging? of > > grammars and the grammar pool from the single root schema can be > > used directly to validate an instance. > > A grammar pool is set on a configuration instance as a feature and > > passed to the constructor of DOMParser: > > DOMParser parser = new > DOMParser(config); > > The grammarPool is locked before parsing and unlocked after parsing > > to prevent further entity resolution. In addition to XML schema > > validation, my application caches Grammars for PSVI analysis and XML > > prototyping. > > Analysis of the grammarPool source code indicates that a warning is > > generated because there must be two instances of Grammar with the > > same target namespace. However, I don?t see this when looking > > through the grammarPool instance. My next step is to step through > > the Xerces-2 sources under my application, but was hoping somebody > > could indicate improper usage on my part. > > thanks, > > -Andy > > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please visit http://www.messagelabs.com/email > ______________________________________________________________________ > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please visit http://www.messagelabs.com/email > ______________________________________________________________________ > > --------------------------------------------------------------------- > 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]
