[Talk-GB] Adding administrative boundaries to OSM Data Layer in JOSM

[Bob Hawkins]

I posted the following on the OSM Help Forum yesterday: 
"I have selected civil parish boundaries from OS Boundary-Line for my area of South Oxfordshire, converted them to WGS84 and created a .osm file. These boundaries are polygons, yet the boundaries in OSM that I see are lines. From some articles I have read, I assume that the OS boundaries are merged with the OSM Data Layer in JOSM and adjusted if necessary to join to existing boundaries or deleted where they are coincident, but they are not completely redrawn. How, then, is the apparent conversion from polygon to line achieved?"
 
Frederik Ramm has replied, informing me to split ways. I had done that and although the ways are split, the polygon still appears to retain its qualities: moving the single way that was split still takes the adjacent ways with it, and selecting any of the other ways still highlights the polygon area. It does not revert to a series of lines, or polyline. Copying the selection to a new layer, the boundary retains its infill, so I would imagine that would display as a coloured area if it was uploaded to OSM. 
Is there something I am missing here?

Bob Hawkins
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