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Each class may be related to one or more other classes by a sub-class relationship ( where the two classes share some semantics such that all resources that are members of the sub-class are also members of the related class . Access to indexing is prey to Internet traffic and server availability ( also note may generate incoming transatlantic traffic for UK users since these services are all in the US ) . Each property may be related to exactly one other property by a sub-property ( refines ) relationship ( where the two properties share some semantics such that all valid values of the sub-property are also valid values of the related property ) . When I find links relevant to the work at hand , I copy and paste them as comment into my code . To intall the macros copy both files into a macro file ( it can be opened by going to tools - > macros and select a file in the combo or create new file and select edit ) and for ease of use make a tool bar button for the macro . The service offers students support in coping with personal problems or academic / study concerns which may interfere with your academic progress .