This page contains informations and thoughts about some tags and how they will be handled.

== altitudeMode ==
 * clampToGround -> will be ignored, Z = 0 in OGR, #
 * relativeToGround -> Z in KML ==> Z in OGR, #
 * absolute -> Z in KML ==> Z in OGR, 100% match

# points aren't exactly the same because of curvature of ground

== !NetworkLink ==
With that you can include other KML files, so you can create on KML file and include 
vektors for streets, for rivers and one file with a raster.

Handling:
 * if the link is online, try to download
 * if download fails, look for the filename in the same directory
 * if that fails, too, warn the user and skip the !NetworkLink

== Placemark ==
A Placemark is an OGRFeature

== Document/Folder ==
Only Documents and Folders that are parent of a Placemark are used as OGRLayers, the rest is dropped.
Perhaps a better solution can be found later, but in GDAL it's not possible to put OGRLayers in OGRLayers.
In KML Documents and Folders are also features.

IrcDiscussion with Mateusz