</strong>
[[File:UDOM_PlantPartRelations.png|thumb|220px|alt=Relations of plant parts|Possible relations between parts of plant]]
An important aspect of the datamodel has not been discussed yet, namely <b>how are the blocks (=MetaClasses) related to each other?</b>
== Relating objects ==
[[File:UDOM_PlantPartRelations.png|thumb|220px|alt=Relations of plant parts|Possible relations between parts of plant]]
Assuming that all three pumps are clearly parts of the plant „UBIK1“, the descriptive model has to be extended in order to include this information as well. In our "table" view we account for this by adding a property to the „Pump“ block refering to the plant. This additional property represents the link information between the pumps #1 - #3 and the plant „UBIK1“.