Index: /trunk/data/gpx-extensions.xsd
===================================================================
--- /trunk/data/gpx-extensions.xsd	(revision 5913)
+++ /trunk/data/gpx-extensions.xsd	(revision 5913)
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://josm.openstreetmap.de/gpx-extensions-1.0"
+	xmlns:tns="http://josm.openstreetmap.de/gpx-extensions-1.0" elementFormDefault="qualified">
+
+    <!-- true, if gpx data has been downloaded from the osm server -->
+    <!-- it this case, JOSM improves the rendering of clouds of anonymous TrackPoints -->
+    <element name="from-server" type="boolean"/>
+    
+    <!-- the following properties are only set for marker layer export -->
+    <element name="offset" type="decimal"/>
+    <element name="sync-offset" type="decimal"/>
+    <element name="text" type="string"/>
+
+</schema>