Find preceding-sibling with specific name and without specific attribute

Question

I have a pretty big test checking order of things and I want to ignore baz elements with an attribute attri that is equal to y, this is what I've tried, but it doesn't seem to be working correctly. It seems to be ignoring baz regardless of attribute:

Context:

jd:foo|jd:bar|jd:baz[@attri != 'y']|jd:bam

Test:

        (name()='foo' and 
          (preceding-sibling::*[local-name()='bar']
           or preceding-sibling::*[local-name()='baz' and @attri != 'y']
           or preceding-sibling::*[local-name()='bam']
          )
       ) or
       (name()='bar' and 
          (preceding-sibling::*[local-name()='baz' and @attri != 'y']
           or preceding-sibling::*[local-name()='bam']
          )
       ) or
       (name()='baz' and 
          (preceding-sibling::*[local-name()='bam']
          )
       )

Answer 1

Your context excludes not only baz elements that contain @attri equal to y, but also baz elements that contain no atrribute. This:

jd:baz[@attri != 'y']

says that baz must have an @attri attribute, and it also must not be y. So a node such as <baz>...</baz> will not be part of the context because it does not contain the attribute. This will include in the context elements like <baz attri='z'>.

If you wish to exclude only the <baz attri='y'> elements (but not the ones that don't have that attribute), you have to use:

baz[not(@attri = 'y')]

which selects all baz elements that have @attri='y' and negates that set. This will include elements that do not have a @attri attribute.

The same applies to your test, if elements without the attribute are to be considered.