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[PR Media Fragment] specify how further keywords would be added

From: Liam R E Quin <liam@w3.org>
Date: Wed, 18 Apr 2012 18:47:37 -0400
To: public-media-fragment@w3.org
Message-ID: <1334789257.18120.218.camel@localhost.localdomain>
I'm sorry for a late comment - I only became aware of this spec today,
or rather that it applied to images.

For images, Media Fragments URI 1.0 appears to say how to interpret a
fragment identifier to take a copped portion of an image.

This raises two questions, for me at least.

First, what if a media fragment syntax is registered for a media type
such as JPEG or TIFF, e.g. through IETF? Which takes precedence and why?
I believe it necessary for this specification to make that clear.

Second, current practice for HTML user agents includes scaling of images
to fit a specified rectangle. One can easily envision other
transformations, such as those included in SVG. How would one extend the
notation defined in Media Fragments URI 1.0 to support a sequence of
transformations, and not only offset and crop? e.g. to scale
horizontally by 50% would it be xySwh=160,120,0.5,320,240 or should
implementers wishing to add such functionality use a syntax like
xywh=160,120,320,240,hscale=0.5 ?

There doesn't seem to be a way to say which version of Media Fragments
one is using, so a clear statemnt about extensibility is very important.

Thank you,


Liam Quin - XML Activity Lead, W3C, http://www.w3.org/People/Quin/
Received on Wednesday, 18 April 2012 22:51:27 UTC

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