Feature request: Custom XMP namespaces

http://dev.exiv2.org/repositories/revision/exiv2/1377 might help

Indeed, this feature is not supported yet and would be nice to have.

As far as I could see, this is already supported in exiv2 - it mainly requires the wrapping of the namespace registration methods, after which the current methods should be able to read/write tags in a custom XMP namespace:

    static void registerNs (const std::string &ns, const std::string &prefix)

Is there any news about that in the current versions? I would like to add my voice to the wishlist motion. :)

This is not planned for the next release (which should contain mostly bug fixes), but it's probably not too hard to implement.
Once a clean way to integrate that functionality in pyexiv2's API has been decided, implementation should be pretty straightforward.

yep we also need to write into our own namespace.
+1

is there a way to fund this?

Relevant documentation: http://exiv2.org/doc/classExiv2_1_1XmpProperties.html.

I’m experimenting with this feature and so far I have a working prototype that allows registering custom namespaces and unregistering them.

There is however a limitation to the type of values that can be written to custom tags, they’re simple text values only. As far as I can see, overcoming this limitation would require substantial work so I need to understand if the limitation is acceptable in a first step.

@all: please comment on your use-cases and whether this limitation would be a problem.

the text values would me ok for me. in my case i would only need to store a uuid and a sha value. i could always transform the values to whatever type in python anyway.

Cool man

best,
christof

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On Nov 30, 2010, at 7:26 AM, aschmid00 <email address hidden> wrote:

> the text values would me ok for me. in my case i would only need to
> store a uuid and a sha value. i could always transform the values to
> whatever type in python anyway.
>
> --
> Feature request: Custom XMP namespaces
> https://bugs.launchpad.net/bugs/549496
> You received this bug notification because you are subscribed to
> pyexiv2.
>
> Status in pyexiv2, a python binding to exiv2: In Progress
>
> Bug description:
> Hello, I would need to create my own XMP namespace to add custom tags to my photos. I didn't manage to figure out how to do it with pyexiv2, I keep getting invalid key exceptions, so I guess it is not possible to do it yet, or am I just missing something?
> I manage to read custom tags though.
>
> Is this a feature that could be implemented?
>
>

That’s correct, additional parsing/serializing of the value in the client code is always possible to store/retrieve complex types. Not the most convenient (as in, it would be easier if pyexiv2 handled it itself), but a possible solution if needed.

Implemented with revision 344 of the trunk.

@all: please test and report your feedback here, I’m curious to see if this implementation provides what you need (hopefully it does!).

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