Add docs of osm format.

diff --git a/xmldoc/formats/options/osm-tag.xml b/xmldoc/formats/options/osm-tag.xml
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+++ b/xmldoc/formats/options/osm-tag.xml
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+<para>
+  With this option you can preset OSM <ulink url="http://wiki.openstreetmap.org/index.php/Map_Features">features</ulink> (tags) on all exported ways.
+</para>
+<para>
+  <userinput>gpsbabel -i gdb -f ways.gdb -o osm,tag="highway:motorway" -F ways.osm</userinput>
+</para>

diff --git a/xmldoc/formats/options/osm-tagnd.xml b/xmldoc/formats/options/osm-tagnd.xml
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+++ b/xmldoc/formats/options/osm-tagnd.xml
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+<para>
+  With this option you can preset OSM <ulink url="http://wiki.openstreetmap.org/index.php/Map_Features">features</ulink> (tags) on every written nodes.
+</para>
+<para>
+  <userinput>gpsbabel -i gdb -f nodes.gdb -o osm,tagnd="amenity:pub;building:yes" -F nodes.osm</userinput>
+</para>

diff --git a/xmldoc/formats/osm.xml b/xmldoc/formats/osm.xml
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+++ b/xmldoc/formats/osm.xml
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+<para>
+  This format is used to exchange data with the <ulink url="http://www.openstreetmap.org">OpenStreetMap</ulink> project. 
+  The main goal of this collaborative project is to create free editable maps.
+</para>
+<para>
+  These data files are XML based. Every GPS element (way or node) described by the files has a unique
+  number as identifier. When we write OSM data files and don't know something about the id's,
+  negative numbers will be used as identifier. This has beed tested with <ulink url="http://wiki.openstreetmap.org/index.php/JOSM">JOSM</ulink>.
+</para>
+<para>
+  Because the resulting timestamps of OSM ways aren't in the manner of real GPS track, 
+  we read OSM ways into routes. On the output side we write all available routes and tracks into the osm target file.
+</para>