Possible URI override for category values

[mboudet]

An URI is built for every attribute of the category type, with the pattern AttributenameCategory.

Meaning if some entities use the same attribute name, the category values will overlap.

We can either

1. Define the uri using the entity name (like EntityAttributeCategory),
2. Use blank nodes (juste like relations & basic attributes)

[mboudet]

Actually, since the categories are separated by graphes, there is no overlap.

(Except in the case where several entities are defined with the same attribute in the same graph, like for GFFs.

Implementing a fix would complexify integration for not much.

[mboudet]

it might actually be an issue when using abstractor in askomics mode, as all graphs are merged...