DTD validation

[Lars Huttar]

Hello, A couple of years ago I asked for help getting DTD validation to work with Cocoon 2.1.8. I got some information but it didn't solve the problem, and I was left with "try looking through the code or running in a debugger". That exchange is included below.[1] The same error occurs in 2.1.11 when I try to validate with a DTD. The codebase is too large for me to analyze... especially for a framework that is supposed to be usable "often without any required programming." I've tried running Cocoon in a debugger but have been unsuccessful. Others have asked about DTD validation. E.g. [2]. But apparently no results were forthcoming. This is really surprising to me, given that Cocoon is built around XML pipelines, and DTD is the only kind of schema language defined as part of the XML standard. Granted, XML Schema is more powerful, and more modern. But for our simple needs, and I'm sure others' too, XML Schema is like using Mathematica to compute 2 + 2. DTD expresses the grammar much more efficiently, for the simple cases. (For corner cases, we use Schematron, which we are able to make work manually because it only requires XML and XSLT, which Cocoon handles well.) I'm all for supporting XML Schema and Relax NG, but for Cocoon not to support DTD's at all just seems baffling. Can any of you Cocoon developers take a look at this please? Unfortunately, we're pretty well tied to Cocoon 2.1.* for now... 2.2 seems to be too big of a structural change for our code base, and 3.0 all the more so. I realize some will be less than motivated to integrate this into the older 2.1.* branch. But we have a lot of time and code invested in Cocoon 2.1, so I thought it was worth asking. At the very least, if someone could tell me authoritatively "no, this is not supported in Cocoon", then I could prune one branch of the search for solutions. Back in 2005, Pier Fumagali wrote (http://www.mail-archive.com/dev@cocoon.apache.org/msg34587.html) This finishes the "validation" block and its implementation. It provides two transformers: one filtering in-line and failing on errors, and one producing a report. Relax-NG is implemented using Jing. XML-Schema is implemented using the JAXP API supplied with Cocoon ... DTD is currently not supported, although it would be trivial to do it with the Xerces supplied with Cocoon. I would love to know whether this ever happened... or if not, how to supply the trivial missing piece to make it happen. Regards, Lars [1] http://markmail.org/message/4jx72f3ngzbuyxze#query:cocoon%20validation-report%20dtd+page:1+mid:4jx72f3ngzbuyxze+state:results Subject: Re: DTD validation: "Unsupported grammar language" From: Joerg Heinicke (joer...@gmx.de) Date: 12/20/2006 04:09:49 PM List: org.apache.cocoon.dev just from having a look at the code: 1. It's http://www.w3.org/TR/REC-xml (see Validator interface and its declared constants). 2. This exception is thrown in AbstractValidator.getValidationHandler() in line 327 in the current code. It is thrown when no SchemaParser can be found. 3. Grammars and their parsers seem to be configured via Configurable.configure(). So maybe the javadoc for this method [1] is helpful. Otherwise you might need to have a look into the code of this method or do some debugging. Regards Jörg [1] http://cocoon.apache.org/2.1/apidocs/org/apache/cocoon/components/validation/jaxp/JaxpSchemaParser.html#configure(org.apache.avalon.framework.configuration.Configuration) On 19.12.2006 18:32, Lars Huttar wrote: Hello, I seconded this question on the Cocoon user list but have not received a response, so would like to ask the developers. In Cocoon 2.1.9, we are trying to use ValidationReportTransformer to validate our XML against a DTD. I'm looking at the documentation at http://cocoon.zones.apache.org/daisy/documentation/864/validation.html and http://cocoon.zones.apache.org/daisy/documentation/components/1058/g2/691.html. The validation sample block has examples for validating against RNG and XML Schema, but not against a DTD. Like José quoted below, I'm trying to figure out how to make it work. Here's my attempt, a copy-and-modify of a match pattern in samples\blocks\validation\sitemap.xmap: <map:match pattern="report-dtd-valid">   <map:generate src=""/>   <map:transform type="validation-report" src="">     <map:parameter name="grammar" value="http://www.w3.org/TR/REC-xml" />   </map:transform>   <map:transform src=""/>   <map:serialize/> </map:match> I added the "grammar" parameter, as instructed by the documentation referenced above, to the validation-report transformer. For grammar identifier, the documentation seemed to indicate I should use "http://www.w3.org/TR/REC-xml". (I also tried "dtd" just for kicks.) But the result is that I get the error org.apache.cocoon.components.validation.ValidatorException: Unsupported grammar languagehttp://www.w3.org/TR/REC-xml Does this mean there is no support for validating against DTDs? Or am I doing something wrong? Thanks, Lars