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Subject: XLIFF 2.1 csprd02: Multiple comments on CTR module

I'm combining several comments into a single message.  The first one is a general concern, and the subsequent ones are specific examples (which may also illustrate that concern, in their own ways).

1. General concern about complexity

I am concerned that this module is suffering from feature creep, and that it will hinder the effective implementation of the module.  The module is now attempting to solve several separate problems at once:
The overloading that makes this possible makes the schema difficult to understand and, I fear, unlikely to be supported fully.  As the content tracking is a substantially different model, it could even be argued that it should be split off to a separate module.

2. Incorrect example in section 5.6.8

The first two <ctr:revisions> elements in the example in 5.6.8 have appliesTo values of "source" and "target" respectively.

By my reading of section, this means that these revisions should use <contentItem> to track the full source and target contents:

If and only if the REQUIRED appliesTo attribute value is source or target, the <revisions> element MUST have exactly one <contentItem> grandchild element.

In the example, these revisions use <item> for the source and target content, which looks incorrect.

3. Questions regarding element hierarchy within <revision>

In describing the contents of <revisions> in, it says:
  • The value of the REQUIRED attribute appliesTo governs the type of and possible content allowed in the grandchildren of specific <revisions> elements:
In section, it is noted that:
Based on these two sections, I infer that it is not possible to have a <item> in the same <revision> as any of unitItem/segmentItem/contentItem:
So it seems like there is no case in which <item> can be present within the same <revision> as one of these specialized units.

However, the element diagram in section, it appears that this is allowed:
  +---<revision> +
    +---<xlf:originaldata> ?
    +---<ctr:item> *
    +---Exactly one of <contentItem> OR <segmentItem> OR <unitItem>)
In what circumstance would this be possible?  And if it is not possible, should the diagram be changed?
4. Use of <xlf:originaldata> in revisions
It is currently legal to include <xlf:originaldata> inside a <revision> element even if the revision only contains <item> data.  This is (I think) nonsensical. 
Wouldn't <xlf:originaldata> only be useful if one of <contentItem>, <segmentItem>, or <unitItem> were present?
5. Use of "property" attribute element in <contentItem>, <unitItem>, or <segmentItem>
In all these elements, "property" is required but has only one possible value.  This appears like it's being done either for symmetry with <item> or for some sort of future-proofing, but I question whether it is useful.

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