[postgis] How to indentify each polygons' donut polygons in multipolygon

[Hisaji ONO]

Hi.

  I've currently developed GML 2.0 convesion code from PostGIS's WKT.

 I've known PostGIS's NumInteriorRings & InteriorRingN function can deal
with interior rings in polygons. But InteriorRingN  function seemed to
support "single" polygons.

 How to identify whether each polygons within multipolygon have interior
rings or not?

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