Well-formedness check fails with double occurrences of xml:ids

[tomschr]

Problem description

Before daps does validation, it checks XML files for syntax errors. This is done by the xmllint command.

However, xmllint conforms also to the xml:id specification which forbids non-unique IDs in XML documents (see below). In this context, xmllint conforms to this spec (which is correct). Unfortunately, it does not contain an option to switch off this behaviour.

This behaviour is needed to create just a syntax check (well-formedness check) which ignores multiple IDs with the same value. However, multiple IDs should be allowed to create the same structure element, but with different content (let's say, a procedure for openSUSE and for SLES both with the same ID, but with different steps). The 2nd step of daps will profile these files to one or the other variant.

Expected behavior

Perform a well-formedness check without taking into account about double or non-unique IDs.

Steps to reproduce the behavior

Create a XML document with the same ID twice.

References

The xml:id specification states:

This mechanism consists of declaring the type of an attribute as "ID", after which the parser will validate that

• the ID value matches the allowed lexical form,
• the value is unique within the XML document, and that
• each element has at most one single unique identifier

[tomschr]

I've tested it with the current SLE documentation (MAIN.SLEDS.xml).

Making a syntax error in the MAIN file, the script responds with:

$ daps-xmlwellformed --xinclude xml/MAIN.SLEDS.xml
ERROR: expected '>', line 72, column 5 (MAIN.SLEDS.xml, line 72)
       xml/MAIN.SLEDS.xml:72:5:FATAL:PARSER:ERR_GT_REQUIRED: expected '>'

Makeing a syntax error in one of the xincluded files, the script responds with:

$ daps-xmlwellformed --xinclude xml/MAIN.SLEDS.xml
ERROR: error parsing attribute name, line 19, column 2
       xml/book_sle_admin.xml:19:2:FATAL:PARSER:ERR_NAME_REQUIRED: error parsing attribute name
       xml/book_sle_admin.xml:19:2:FATAL:PARSER:ERR_SPACE_REQUIRED: attributes construct error
       xml/book_sle_admin.xml:19:2:FATAL:PARSER:ERR_GT_REQUIRED: Couldn't find end of Start Tag book line 15
       xml/book_sle_admin.xml:19:2:FATAL:PARSER:ERR_DOCUMENT_END: Extra content at the end of the document
       xml/MAIN.SLEDS.xml:79:0:ERROR:XINCLUDE:XINCLUDE_NO_FALLBACK: could not load xml/book_sle_admin.xml, and no fallback was found

Both error messages are correct.