Remove unused url attribute

And also make sure that the model is re-checked when the schema changes.

Change-Id: I348d11aa770255329cd47535dff4b15a95e4bd8e

writerfilter/CustomTarget_source.mk

@@ -76,7 +76,7 @@ $(writerfilter_GEN_ooxml_Factory_hxx) : $(writerfilter_SRC)/ooxml/factoryinc.py
 	$(call gb_Output_announce,$(subst $(WORKDIR)/,,$@),build,PY ,1)
 	$(call gb_Helper_abbreviate_dirs, $(writerfilter_PYTHONCOMMAND) $< $(writerfilter_GEN_ooxml_Model_processed)) > $@
 
-$(writerfilter_GEN_ooxml_Model_validated) : $(writerfilter_SRC_ooxml_Model)
+$(writerfilter_GEN_ooxml_Model_validated) : $(writerfilter_SRC)/../documentation/ooxml/model.rng $(writerfilter_SRC_ooxml_Model)
 	$(call gb_Output_announce,$(subst $(WORKDIR)/,,$@),build,VAL,1)
 	$(call gb_Helper_abbreviate_dirs,\
 		$(writerfilter_XMLLINTCOMMAND) --noout --relaxng $(writerfilter_SRC)/../documentation/ooxml/model.rng $(writerfilter_SRC_ooxml_Model) > $@ 2>&1 \

writerfilter/documentation/ooxml/model.rng

@@ -259,9 +259,6 @@ documentation for that file. The schema has two parts:
       <optional>
         <attribute name="file"/>
       </optional>
-      <optional>
-        <attribute name="url"/>
-      </optional>
       <zeroOrMore>
         <ref name="start-element"/>
       </zeroOrMore>

writerfilter/source/ooxml/model.xml

@@ -44,7 +44,7 @@
   <token tokenid="ooxml:footerl"/>
   <token tokenid="ooxml:footerr"/>
   <token tokenid="ooxml:footerf"/>
-  <namespace name="dml-stylesheet" url="http://schemas.openxmlformats.org/drawingml/2006/main" file="dml-stylesheet.rng">
+  <namespace name="dml-stylesheet" file="dml-stylesheet.rng">
     <start name="theme"/>
     <start name="themeOverride"/>
     <start name="themeManager"/>