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Here are a couple examples of using base64 to encode audio:
http://stackoverflow.com/questions/2270151/is-it-possible-to-use-data-uris-in-video-and-audio-tags



On 12/17/2012 10:12 AM, John P. McCaskey wrote:
> I'd have thought <binaryObject> was the obvious answer.
>
> -- JPM
>
> On 12/17/2012 9:01 AM, Syd Bauman wrote:
>> [Heh-heh. I've been expecting this question ... :-]
>>
>> I think the answer is yes, you *can* encode a pointer to an audio
>> file using <graphic>. There are three problems, though.
>>
>> 1) The tactical semantics are incorrect. Even though to a casual
>>     reader it is clear that
>>        <graphic url="../sound/I_Have_a_Dream.ogg"
>>                 mimeType="audio/ogg" />
>>     refers to an audio file, the Guidelines clearly state that
>>     <graphic> is for "an inline graphic, illustration, or figure".
>>
>> 2) The attributes are incorrect. <graphic> has, e.g., height= and
>>     width=, but does not have dur=.
>>
>> 3) The strategic semantics are probably incorrect. I'm not sure of
>>     your situation, but remember that the TEI is primarily about
>>     encoding extant texts. (Which is not to say we don't use it for
>>     born-digital stuff, we do.) So the <graphic> element is primarily
>>     intended to represent a graphic that exists in an existing
>>     physical document. (E.g.,
>>     http://www.sffaudio.com/images08/flatland500.jpg.) So if what
>>     you're doing is adding a pointer to something else, e.g., to an
>>     audio instantiation of the current document, or a commentary on
>>     it, then encoding with <figure> and <graphic> may not be the right
>>     thing to do anyway.
>>
>> In any case, I'd recommend either:
>>
>> A) Using <ptr>:
>>        <ptr type="facsimile"
>>             subtype="audio"
>>             target="../sound/I_Have_a_Dream.ogg"
>>             mimeType="audio/ogg" />
>>
>> B) Customizing TEI as to create a new <my:audio> element that is much
>>     like <graphic>, but has correct semantics and attrs.
>>
>> Other possibilities (which I'm not as fond of) are to abuse the
>> <graphic> element or the facs= attribute.
>>
>>
>>> Hi all Excuse me if my questions seems answered somewhere, but I
>>> couldn't find them (after reading the relevant parts of guidelines
>>> and searching the list for similar questions). As I understand from
>>> the guidelines, one can include a picture or video using the
>>> <graphic> element. Is it impossible to include an audio file in an
>>> article or e-book? How one can include an audio file in a text.
>>> Also, some texts of great importance may be a subject of teaching
>>> for some famous scholars which may be treated as a teaching of
>>> parts of the main text or some vocal comments or description or so
>>> about parts of text. How one can encode such features using the
>>> TEI? Thank you so much
>