Hi devs,

I’ve briefly looked at the source code of the XFF module (sources at 
https://github.com/xwiki-contrib/api-xff) and here’s what I think the status is.

Current Status
============

* A Maven plugin exists to package the sources in the XFF format into a XFF zip 
(.xff file). See 
http://extensions.xwiki.org/xwiki/bin/view/Extension/XFF+Maven+Plugin

* A Filter Stream filter exists (see 
http://extensions.xwiki.org/xwiki/bin/view/Extension/XFF+filter) for importing 
a XFF file (.xff file) into a running XWiki. You need to install the Filter 
Stream application to use it: 
http://extensions.xwiki.org/xwiki/bin/view/Extension/Filter+Application (input 
= the XFF filter, output = 
http://extensions.xwiki.org/xwiki/bin/view/Extension/Filter+XWiki+Instance+module).

Note: Since there exists a XAR Filter streams input/output filter already, we 
can convert a XFF zip (.xff file) into a XAR file (.xar file).

* A XFF REST API also exists to push a XFF file into a running XWiki. 
Apparently it uses the Filter Stream API to read the XFF file using the input 
filter and it uses the XWiki filter output filter as the output. However this 
REST API has to be used manually (curl)… So it’s a shortcut from having to 
install the Filter Streams Application in your wiki for importing an XFF file.

To summarize, right now you should be able to have an XFF structure in your 
maven project and import it into a running XWiki (either using curl or through 
the Filter Streams Application in your wiki).

What’s missing
============

* Lot of code cleanup ;)

* There doesn’t seem to be a XFF output filter so we cannot take as input an 
xwiki instance and as output a XFF file (nor convert from XAR to XFF). Thus, 
right now I don’t think we can do round-tripping

* The XFF format needs to be reviewed and discussed on the list for improving 
it. Apparently it’s possible to have content specified outside of the page.xml 
file (see 
https://github.com/xwiki-contrib/api-xff/blob/f0e32aae3e852e966b0d2bf6648c93a5eca6cd25/xff-core/src/test/resources/package/wikis/xwiki/spaces/Space/pages/Page/metadata/content.xwiki21)
 but I’m not sure how this is working. In this example there’s both content 
defined in page.xml and in content.xwiki21. Not sure which one wins… It’s 
possible that this wasn’t fully implemented yet.

* I think it would be nice to have an XFF mojo to generate a XAR file (using 
the existing XAR Filter Stream filter).

* It would also be nice to have a mojo to publish directly the source content 
to a running XWiki instance, using the provided REST API. Instead of having to 
use curl manually to do that. Similarly, once a XFF output filter is coded, it 
would be nice to have a mojo to automatically retrieve the data from a running 
XWiki instance and save them in the sources.

Please correct me if I’m wrong!

Thanks
-Vincent





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