Refine conditional {ex,in}clusion terms.

[skynavga]

• section 2.2

  • [conditionally excluded (or included)] clarify
    that the descendants of a conditionally excluded element are
    all conditionally excluded;

  • [conditionally excluded (or included)] clarify that an element
    is conditionally included if it is not conditionally excluded;

  • introduce sub-term unconditionally included

[nigelmegitt]

To me this seems a bit too much for the terminology section. The rules are already specified in §8.2.1.

One thing I do notice is that we cannot both exclude all descendants of a conditionally excluded element and except the ignoring of timing semantics.

For example, the timing of an element:

<div timeContainer="seq">
<div condition="false"> <!-- timing is defined by its descendants that are excluded -->
   <p begin="10s" end="15s">
      <span>Some text</span>
   </p>
</div>
<div>
   <p>
      <span>This text should appear at 15s always</span>
   </p>
</div>
</div> <!-- seq container -->

This may need a different issue...