+/*
+* Requests for point refer directly to point symbols that should be placed.
+* Line and area requests are in fact requests for labels (either symbols or
+* textual labels) of such objects.
+* Area requests are taken quite as-is,
+* line requests are broken into section and segment requests -- each line
+* is broken into sections of maximal length and each section is made of segments
+* which correspond to OSM ways.
+* For each line, exactly one segment of each section is labelled in the output.
+*/
+