[aKregator-devel] [Bug 97225] New: WISH: support for multi-namespace feeds such as CMLRSS

[Egon W. <e.w...@sc...>]

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http://bugs.kde.org/show_bug.cgi?id=97225         
           Summary: WISH: support for multi-namespace feeds such as CMLRSS
           Product: akregator
           Version: 1.0-beta8
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: akregator-devel lists sourceforge net
        ReportedBy: e.willighagen science ru nl


Version:           1.0-beta8 (using KDE 3.3.1,  (3.1))
Compiler:          gcc version 3.3.5 (Debian 1:3.3.5-4)
OS:                Linux (x86_64) release 2.6.10-9-amd64-k8-smp

There is a number of RSS feeds [1] that have extra content
in news items, e.g. as in:

<item rdf:about="http://wwmm.ch.cam.ac.uk/Bob/cod/demo/exampleSubmission/3D/NSC1.xml"> 
    <dc:format>text/html</dc:format> 
    <dc:date>2004-02-24</dc:date> 
    <dc:source>NCI - National Cancer Institute</dc:source> 
    <dc:creator>Yong Zhang</dc:creator> 
    <title>NSC1</title> 
    <link></link> 
    <description>NSC1 fron NCI</description> 
    <cml:molecule title="NSC1"> 
        <cml:atomArray> 
            <cml:atom id="a1" elementType="O" x3="0.0021" y3="-0.0041" z3="0.0020"/> 
            <cml:atom id="a2" elementType="O" x3="-0.0691" y3="5.2414" z3="0.0323"/> 
        </cml:atomArray> 
        <cml:bondArray> 
            <cml:bond atomRefs2="a1 a3" id="b1" order="2"/> 
            <cml:bond atomRefs2="a2 a8" id="b2" order="2"/> 
        </cml:bondArray> 
    </cml:molecule> 
</item>

This examples shows CMLRSS [2] which extends regular RSS feeds with molecular content.

Akregator can display such feed, e.g. [3], without problem, but it would be nice that such extra content, with any namespace, would be shown as sort of attachments, to allow that content to be opened by other programs, i.e. with Open With...

Now, one problem is that XML namespaces need to be mapped to MIME types, so that Open View... can use regular KDE stuff...

The namespace used for the molecular content in CMLRSS feeds, is "http://www.xml-cml.org/schema/cml2/core", i.e. CML2 [4], and that maps to the mime type "chemical/x-cml" [5].

The scheme of:
 1. noting extra elements in the RSS item element
 2. resolving it's namespace into mime type
 3. display extra content as attachment
 4. allow "Open With" for attachment
is a general mechanism and not limited to chemistry what
so ever...

Of course, such attachments should *not* be opened automatically, because of security hazards.

Egon

1. http://wwmm.ch.cam.ac.uk/moin/CmlRssFeeds
2. http://wwmm.ch.cam.ac.uk/moin/CmlRss
3. http://www.bristol.ac.uk/Depts/Chemistry/MOTM/rss.xml
4. http://wwmm.ch.cam.ac.uk/moin/ChemicalMarkupLanguage
5. http://www.ch.ic.ac.uk/chemime/