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Neil wrote "I think there is general concensus in favour of standard GIS icons / "symbologies" " Is this the case? The message I'm getting is more that there is a need for standard ways of *describing* features on GIS systems which can then be *depicted* by whatever symbol sets, line types etc are supported by a particular combination of software, monitor, printer etc. Crispins suggestion of a terminology of agreed feature types is I think the key to this. The Alexandria thesaurus looks attractive, but perhaps over-complex for the data we are dealing with. Edmund