# IRingAbstract.h File Reference

`#include <FdoCommon.h>`
`#include <Geometry/IEnvelope.h>`
`#include <Common/Dimensionality.h>`

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## Classes
class | FdoIRingAbstract
| The FdoIRingAbstract class is a ring Geometry helper type (abstract). FdoIRingAbstract is the most general ring type. It is similar to CurveAbstract, but is always closed. More...