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Object

-              v78
+              v79
 A water object ({{{natural=water}}}), a building ({{{building=*}}}) or administrative boundary ({{{admin_level=*}}} tag) usually consist of the  multiple spatially separated parts belonging to the one object. More importantly, each of these parts can have exclusions ([https://en.wikipedia.org/wiki/Enclave_and_exclave enclaves/exclave] or simply islands or swamps in the water basins).
+* Parts are created using "{{{outer}}}" role
+* Holes inside parts - using "{{{inner}}}" role
+* rarely, if nesting is more complex than ''single outer'' and ''single inner ring'', role swapping can continue: outer-inner-outer-inner-...
+* Outer and inner rings shouldn't have common nodes (but validator will warn you about this and other mistakes)
 Multi-polygon specific tools: