Functional semantics of a component is an important factor for the reuser to understand and judge the reusability.So it is important to give the representation of components on the same knowledge base of component developers and reusers.Now there have been some appro aches

which introduce ontology as the base of semantic representation for components.However

they have some shortages in precision and support for semantics reasoning when composition.A meta-model of domain ontology supporting semantic representation of components is presented.Based on the meta-model port semantics

static semantics and semantic protocol of components and the semantics composition algorithm are given.Then semantics of components can be composed along with component composition according to the static semantics and the algorithm.It can help developers to perform the semanticsbased adaptation and composition analysis of components.