I have several KML files with MultiGeometry inside one single placemark. When these files are viewed through Google Maps, the placemark is repeated N times in the left column where N are the number of geometries inside the MultiGeometry block. In my case, these are LineStrings. So the general structure is this
<Document>
<Folder>
<Placemark>
<MultiGeometry>
<LineString>
<coordinates>
............
</coordinates>
</LineString>
<LineString>
<coordinates>
............
</coordinates>
</LineString>
.....
</MultiGeometry>
</Placemark>
.....
</Folder>
....
</Document>
For an example, see
http://maps.google.no/?q=http://www.skiforeningen.no/markadb/kml/loypestatus/5.kmlBrowse down to the red tracks far down in the table of contents in the left column. The track with number 409 appears multiple times in the folder, but has only one - 1 - Placemark entry in the KML file, adhering to the above structure.
Any idea?
Btw, these files show groomed xc-skiing tracks around Oslo, colors indicating how fresh the grooming is.