Clarify use of validator to warn about overly constrained profiles (#506

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w3c · Feb 13, 2020 · 53faae4 · 53faae4
1 parent 83f8f61
commit 53faae4
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/imsc1/spec/ttml-ww-profiles.html b/imsc1/spec/ttml-ww-profiles.html
@@ -452,6 +452,13 @@ <h3>General</h3>
       it is not possible to construct a <a>Document Instance</a> that results in the presentation of both text data and image
       data.</p>
 
+      <p class='note'>Authors can use TTML content verification tools to detect
+      and warn about overly constrained uses of content and processor profile
+      attribute vocabulary, e.g. warn if (a) a document simultaneously (i)
+      specifies conformance to content profile X and (ii) requires use of
+      processor profile Y, and (b) profiles X and Y are semantically
+      incompatible.</p>
+
       <p>In applications that require subtitle/caption content in image form to be simultaneously available in text form, two
       distinct <a data-lt="Document Instance">Document Instances</a>, one conforming to the <a>Text Profile</a> and the other
       conforming to the <a>Image Profile</a>, SHOULD be offered. In addition, the <a>Text Profile</a> <a>Document Instance</a>