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I have a couple of questions:
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As I already hinted on in my answer to the previous question the situation is a bit of a mess. In the examples you used you naturally know because the value of ele and ele:wgs84 are the same that you actually have WGS84 height over the ellipsoid in front of you. But if you have a naked "ele" tag you will only be able to use heuristics to determine which reference system was used in generating the value. For Ireland this will probably work as a converter (not tested) http://www.osi.ie/calculators/converter_index.asp?alias=/services/gps-services/co-ordinate-converter Thanks for the replies. I added a few elevations for mountains in Dublin in wgs84 format. I took a nearby mountain with both values to work out the difference over local and wgs84 height. Far from perfect but better than having no information I think.
(30 Aug '12, 14:41)
Dafo43
If you do so, you may indicate source:ele:wgs84=extrapolation
(30 Aug '12, 15:11)
NicolasDumoulin
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This was previously added as an answer to this question, but is really a question in its own right.
An example of an item with different elevations in different co-ordinate systems is Croagh Patrick in the west of Ireland.