+/* This extension creates a map using OpenLayers to show sledrun details and sledrun overviews.
+This extension depends on no other extension.
+
+
+Example 1
+---------
+
+<wrgmap lat="47.267648" lon="11.40465" zoom="10"/>
+
+(Shows icons for all sledruns. lat, lon and zoom are optional.)
+
+
+Example 2
+---------
+
+<wrmap lat="47.2417134" lon="11.21408895" zoom="14" width="700" height="400">
+
+<gasthaus name="Rosskogelhütte" wiki="Rosskogelhütte">47.240689 11.190454</gasthaus>
+<gasthaus name="Stiglreith">47.238186 11.221940</gasthaus>
+<gasthaus name="Sulzstich">47.240287 11.203006</gasthaus>
+<parkplatz>47.245789 11.238971</parkplatz>
+<parkplatz>47.237627 11.218886</parkplatz>
+<haltestelle name="Oberperfuss Rangger Köpfl Lift">47.245711 11.238283</haltestelle>
+<achtung name="Kreuzung mit Schipiste">47.2383200 11.2235592</achtung>
+
+<gehweg>
+47.238587 11.203360
+47.239743 11.203522
+47.240135 11.203247
+</gehweg>
+
+<gehweg>
+47.238442 11.203263
+47.237799 11.203511
+47.237133 11.202988
+47.238091 11.206642
+47.237273 11.211675
+47.237133 11.214466
+47.237513 11.218199
+</gehweg>
+
+<alternative>
+47.240487 11.190169
+47.238996 11.188628
+47.238987 11.188018
+47.238267 11.187075
+47.238461 11.190511
+47.239751 11.191795
+47.240037 11.192702
+47.239525 11.193535
+47.239688 11.194272
+47.239017 11.193925
+47.239536 11.195457
+47.240063 11.196230
+47.240747 11.196658
+47.239734 11.198295
+47.238857 11.198346
+47.237743 11.199778
+47.238250 11.202755
+47.238587 11.203360
+</alternative>
+
+<rodelbahn>
+47.238587 11.203360
+47.238185 11.203982
+47.238297 11.204381
+47.239417 11.204972
+47.239210 11.208772
+47.238999 11.209523
+47.239126 11.209839
+47.238933 11.210641
+47.239102 11.210739
+47.238666 11.215042
+47.238203 11.216089
+47.238183 11.218151
+47.237851 11.218599
+47.238055 11.219755
+47.237686 11.222441
+47.238000 11.223367
+47.238625 11.223687
+47.239915 11.223118
+47.240992 11.219781
+47.243412 11.214141
+47.243207 11.218331
+47.243990 11.216205
+47.243785 11.223251
+47.242845 11.228510
+47.242917 11.232501
+47.242524 11.235001
+47.244737 11.231791
+47.244951 11.230868
+47.245470 11.237853
+</rodelbahn>
+
+<lift>
+47.245656 11.237286
+47.238189 11.221344
+</lift>
+
+</wrmap>
+
+
+
+Definition
+----------
+
+* <wrmap>...</wrmap> has to be valid XML.
+* All coordinates are in WGS84 coordinate system.
+* Coordinates have the preferred format "latitude N longitude E",
+ however for parsing the N and E can be omitted.
+* <wrmap> has the following attributes:
+ * lat (float): latitude of map-center, optional.
+ * lon (float): longitude of map-center, optional.
+ * zoom (integer): zoom level of the map (google zoom levels). optional.
+ * width (integer): width of the map in pixel. optional (100% if omitted)
+ * height (integer): height of the map in pixel. optional.
+ * <wrmap> can have any number of the following sub-elements:
+ * <gasthaus>
+ * <haltestelle>
+ * <parkplatz>
+ * <achtung>
+ * <foto>
+ * <verleih>
+ * <punkt>
+ * <rodelbahn>
+ * <alternative>
+ * <gehweg>
+ * <lift>
+ * <anfahrt>
+ * <linie>
+ * The order may be used by the renderer to determine in which order the
+ elements should be drawn.
+* <gasthaus>, <haltestelle>, <parkplatz>, <achtung>, <foto>, <verleih> and <punkt> define points
+ * The elements may have the following attributes:
+ * name (string): defines the name (not the label) of the element
+ * wiki (string): name of a MediaWiki page the point refers to
+ * The content is exactly one coordinate pair.
+* <rodelbahn>, <alternative>, <gehweg>, <lift>, <anfahrt> and <linie>
+ define non-closed polygons.
+ * They may have the following attributes:
+ farbe (hex format, e.g. #12a50f): color of the line
+ dicke (int): width of the line in pixel
+ * The content of the elements are a whitespace separated list of
+ coordinates.
+
+
+For transmitting the map to javascript, geojson is used in the <div> element of the map.
+This way, an extra request is avoided. The geojson format used here consists of a single
+"FeatureCollection" (representing the <wrmap>) containing the sub-elements of wrmap
+as features.
+The features have an properties key that has a hash as values with the properties of
+the XML subelements of wrmap. Optional attributes/properties can be omitted.
+Additionally one mandatory property key is called 'type' and has the sub-element's name
+as value.
+The featurecollection itself has a properties key as well containing the attributes of
+the wrmap element.
+*/
+