[lxml-dev] Re: Repeating RelaxNG validation

[Robert Kern]

Martijn Faassen wrote:

> Would you be willing to write a C version of this and post a message to
> the libxml2 mailing list? If not, let me know, and I'll try to write a C
> version and report it myself.

Yup, it's a libxml2 bug. Apply the attached patch to testRelax.c in the
libxml2-2.6.21 distribution (possibly earlier ones, too).

[test]$ ~/src/libxml2-2.6.21/testRelax nbk.rng tut-2.3.5-bad.nbk
tut-2.3.5-bad.nbk:17: element ipython-block: Relax-NG validity error :
Expecting element ipython-cell, got para
tut-2.3.5-bad.nbk:17: element ipython-block: Relax-NG validity error :
Element ipython-block failed to validate content
Relax-NG validity error : Extra element ipython-block in interleave
tut-2.3.5-bad.nbk:17: element ipython-block: Relax-NG validity error :
Element sheet failed to validate content
tut-2.3.5-bad.nbk fails to validate
tut-2.3.5-bad.nbk validates

The same problem occurs with the pair of files
test/relaxng/docbook{.rng,_0.xml} from the libxml2 source distribution.

-- 
Robert Kern
rkern at ucsd.edu

"In the fields of hell where the grass grows high
 Are the graves of dreams allowed to die."
  -- Richard Harter
-------------- next part --------------
--- libxml2-2.6.21/testRelax.c	2005-01-04 06:49:47.000000000 -0800
+++ testRelax.c	2005-09-09 19:34:34.000000000 -0700
@@ -143,6 +143,23 @@
 		    int ret;
 
 		    ctxt = xmlRelaxNGNewValidCtxt(schema);
+                    xmlRelaxNGSetValidErrors(ctxt,
+                            (xmlRelaxNGValidityErrorFunc) fprintf,
+                            (xmlRelaxNGValidityWarningFunc) fprintf,
+                            stderr);
+                    ret = xmlRelaxNGValidateDoc(ctxt, doc);
+                    if (ret == 0) {
+                        printf("%s validates\n", argv[i]);
+                    } else if (ret > 0) {
+                        printf("%s fails to validate\n", argv[i]);
+                    } else {
+                        printf("%s validation generated an internal error\n",
+                               argv[i]);
+                    }
+                    xmlRelaxNGFreeValidCtxt(ctxt);
+
+                    /* Try again */
+                    ctxt = xmlRelaxNGNewValidCtxt(schema);
 		    xmlRelaxNGSetValidErrors(ctxt,
 			    (xmlRelaxNGValidityErrorFunc) fprintf,
 			    (xmlRelaxNGValidityWarningFunc) fprintf,