these masts are all used for wireless communications in some form.

OSM Page: http://wiki.openstreetmap.org/wiki/Tag:man_made%3Dtower

We need to create transponders as well so we can map the relationship between the tower and its uses. See OSM page for how this should be done.

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RP: http://wiki.openstreetmap.org/wiki/Proposed_features/Communications_Transponder

the LINZ data lists two mast_use fields, but OSM does not have this capability. however, we can use either commas or semi-colons (i can't remember which) to demarcate within one field. is there a way to conflate two tags into one field with this tool? does a second tag overwrite or append new data?
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HB: AFAICT a semicolon is most appropriate, but there is no formal way defined and lacking
a formal rule using it will be ignored by most things that work by matching exact strings. So
I've set mast_use2 up as LINZ:mast_use2 instead of trying to code :service to
value="use1;use2" but only add the ; if use2 exists, etc. But I am not at all opposed to
value="use1;use2", actually I sort of would prefer it.
see http://wiki.openstreetmap.org/wiki/Proposed_features/Value_separator
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HB: fixed height and use2 to export only if they exist.
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RP:Hamish:OK, the second tag-value pair looks best for now. i doubt there is or will be anytihng in osm that could act on both, so this looks ready to me
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Chathams imported by HB 19 Apr 2010
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HB 21 Aug 2012: In the new dataset only the 'height' field remains. Mast_use(1,2) could be removed now, but I'll just leave them there doing nothing for old time's sake. Approved & uploaded for the Antarctic, mainland seems ready to me.