1. Direct Feature Extraction
   1. Area
   2. Elongation
   3. Shapes
2. Relationships
   1. Parallel
   2. Above
   3. Below
   4. Orthogonal
3. RDF
   1. Tupel Relation
   2. Logic
   3. Threshold
4. OWL
5. Reasoner
   1. Pellet
   2. Fact++
6. API
   1. OWL API
   2. Jena