heterogeneity: syntactic, schematic, and semantic. In this paper, 
an overview of the technology showed that research efforts 
have to streamlined in order to achieve our objective. A novel 
concept for semantic data sharing is introduced. In this context, 
the difference between syntax and semantics is shown. Then a 
theory for building semantics onto syntax is explained. The 
concept is based on using hierarchy theory in building 
semantics onto syntax. The next phase in this research to build 
a prototype that implements the introduced concept. The 
prototype will be built using an expert system for introducing 
rules for controlling the access of nodes, context, hierarchies 
and classes. Information required for executing the rules will 
be stored in an object oriented metadata. 
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