Where will the definitions for mapping infobox fields to Wikidata properties be stored?
Is there a Mediawiki/Wikibase installation where a sample can be seen?
Topic on Talk:Wikidata Bridge
Interesting. Wouldn't it be just the existing mapping?
Which is defined in various places ..
It will be just like it is now: each type of infobox of each wiki can have a defined list of fields, usually defined in the Lua code. The Bridge will not change that, as it will only add a layer for editing the data.
How does "Bridge" guess which property/statement to edit?
It is integrated in the code of each infobox. For example, here's the code of the infobox for fictional characters on Catalan Wikipedia. There is no guess here, it's defined by the infobox creators.
Does it work specifically with the format of the Catalan infobox or would it also work with other formats?
I think Krbot had some problems identifying all different ways infoboxes use to define this.
The Catalan infobox is just an example. On the long run, the Bridge will be able to work with any format of infobox defined by the maintainers. During the first steps of the deployment, we may focus on the infoboxes used by the Wikipedia communities who will beta-test the feature.
How can I see if an infobox is supported or not?
@Lea_Lacroix_(WMDE): would you check with the developers to find out where/how it's defined to be recognized by the extension?
I don't understand what you want to know. It's way too early to check if an infobox is supported or not, as the feature is not even finished. Later, it will be deployed on some wikis, and the infobox maintainers will be able to activate the Bridge features for some or all infoboxes. What exactly should be recognized by the extension?
How does the extension know which property or statement goes with a value displayed in the infobox?
e.g. how does the extension get from the mother at ca:Harry Potter (personatge) to d:Q3244512#P25.
It must already be defined somewhere.
Would one need to insert a manual edit link in the infox?
Yes. In the first version the Bridge will hook into the links that are used in edit pens like on this article's infobox. The template editor will need to make a small adjustment (adding a parameter to the link) for it to work but it's a minimal change.
I agree with @Lydia Pintscher (WMDE) that we must assume that something must be changed/added on the infobox code to inform Bridge which are the properties (in plural) involved in a "conceptual block". The current demo infobox of telescope is not the best example to understand what are the properties/qualifiers involved in block of information, because each information concept in this demo respond to one property. I suggest you see as a reference (not as the objective for first version of Bridge!) this three cases.
Although solve any situation is not part of the first phase (btw, smart decission), we need to know the whole complexity of the structures shown in infoboxes, to be able to identify the new internal tools (mapping ?) or rules we need to build/have within infoboxes to make understable to others uses, as Bridge.