Our final goal to represent an ontology of composite materials has not
been discussed here. We currently use the ontology of the individual
components to develop an axiomatization for composites. However,
this cannot be performed by simply adding individual components
presented here via a has--part relation, even if its semantics would
be defined with a complex linear rule of mixture (cf p. 
).
Beforehand, the properties of the components of the participating
materials have to be defined for the case that the materials occur as
fibers. In that case an isotropic material (E--modulus is equal in all
directions) may show different E--modulus along and perpendicular to
the fiber direction. We have already prepared the ontology for this
requirement by introducing the E--modulus as a vector for all
materials.