ISSUE-110: Draft note

Hi,

I think that adding the following note at the end of section "7 Using
ITS Markup in XHTML" should resolve any potential ambiguity.

Please note that this section defines how to use ITS in XHTML content
which is directly served to Web browsers. Such XHTML is very often sent
with a wrong media type and parsed as HTML not as XML in Web browsers.
In such case it is more robust and safer to use HTML-like syntax for ITS
metadata.

However when XHTML is not used as a delivery but rather as an exchange
or storage format all XML features can be used in XHTML and it's advised
to use XML syntax for ITS metadata.

Comments? If you are happy with such wording I will update spec.

    Jirka

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