Im writing an importer for OSM files. Now i'm importing the relations with multipolygoins.

The documentation says

The order of the relation members does not matter (but properly sorted member lists can help human editors to verify completeness). 

Is there a pre defined algorithm to find the ways which form one closed polygon? Preferably in java


Yes, there is. JOSM is written in Java and it is able to order members of various relations very well.

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