Update profile README.md

Author: fkleedorfer

src/main/profile/README.md

@@ -36,9 +36,17 @@ Variables used:
 Basic idea:
 1. collect included entities (one statement per entity `?profile qudt:includes ?resource` in a graph that is
 being generated by the algorithm)
-2. collect excluded entities; 'excluded' means: the entity's inclusion is canceled out. It does not mean that
-any non-excluded entities are included. This makes it easier to calculate results eg via SHACL-AF inference
-(one statement per entity `?profile qudt:excludes ?resource`.)
+2. collect excluded entities; (one statement per entity `?profile qudt:excludes ?resource`.)
+3. Make a new distribution file in the profile if the file contains any of the included entities. Copy only the included
+entities' data.
+4. In this process, ignore all entities that are 'excluded'.
+
+**Important**: exclusion of entities only cancels their inclusion (if they are included at all). It does not mean that
+any non-excluded entities are included.
+Reason:
+- It is possible to infer additional exclusions based on existing exclusions (e.g. derived units of an excluded unit).
+That is not possible if only inclusions are used.
+- SHACL-AF inference only allows for generating triples, not deleting them, so the approach is natural in this case
 
 Algorithm: