Add parameters to search queries

[rschalkrce]

As discussed in the 11-03-24 NoT meeting, it would be interesting to consider adding (controlled) parameters to search queries. This would allow users to search for specific types of terms, e.g. persons or locations. It could also help integration of NoT URI's into collection management systems by restricting the type of terms that can be used in a certain metadata field.

Since implementing this is quite a change, both technical and in the management of types we allow, we want to discuss this first.