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Re: Expressing complex regions with media fragments - use cases + possible solution

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Thu, 9 Sep 2010 23:13:34 +1000
Message-ID: <AANLkTin1Btf11oMAMonFGvEMvVbK-+xkcDk74SnzPeTy@mail.gmail.com>
To: raphael.troncy@eurecom.fr
Cc: Davy Van Deursen <davy.vandeursen@ugent.be>, Jack Jansen <Jack.Jansen@cwi.nl>, Bernhard Haslhofer <bernhard.haslhofer@univie.ac.at>, public-media-fragment@w3.org, Robert Sanderson <azaroth42@gmail.com>, Simon Rainer <Rainer.Simon@ait.ac.at>
2010/9/9 RaphaŽl Troncy <raphael.troncy@cwi.nl>

> Hi Silvia,
>
>
>  I'd go as far as saying that if it is possible to write the
>> specification of the region highlight in a document rather than in a url
>> as Bernhard has done in his examples, there isn't a need for reference
>> URLs and the svg-fragment example is perfectly fine. Just use SVG filters:
>>
>> <?xml version="1.0" ?>
>> <r:RDF xmlns:r="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>>       xmlns:a="http://www.w3.org/2000/10/annotation-ns#"
>>       xmlns:d="http://purl.org/dc/elements/1.1/">
>> <r:Description>
>> <a:annotates r:resource="http://serv1.example.com/some/page.html"/>
>> <x:svg-fragment rdf:parseType="Literal">
>> <svg:defs xmlns:svg="http://www.w3.org/2000/svg">
>> <svg:filter id="c1">
>> <svg:symbol id="Polygon" xmlns:svg="http://www.w3.org/2000/svg">
>> <svg:polygon fill="none" points="52,203 0,124 186,0 238,80 52,203 "
>> stroke="rgb(255,0,0)" stroke-width="0"
>> xmlns:svg="http://www.w3.org/2000/svg"/>
>> </svg:symbol>
>> </svg:filter>
>> </svg:defs>
>> <svg:img height="270px" width="480px" "http://example.com/image1.jpg"
>> filter="url(#c1)"/>
>> </x:svg-fragment>
>> </r:Description>
>> </r:RDF>
>>
>> You can define the mask in that same file (as done above) or in a
>> different file, so you will basically get what you want for free with
>> the @filter and relative url there.
>>
>
> Sure, this will work. But if I have 10 annotations to the same fragment, I
> need to redefine it every time. This is all the purpose of referring to it
> :-)


No you don't.

There is a  filter="url(#c1)" thing that you can use in SVG to link to the
same mask as often as you like. Further, you can just put the mask into a
separate SVG file and link to it as filter="url(mask.svg#c1)" . Total
flexibility!

Cheers,
Silvia.
Received on Thursday, 9 September 2010 13:14:46 GMT

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