# OSGeo::FDO::Commands::Schema::IPhysicalElementMapping Interface Reference
[OSGeo::FDO::Commands::Schema]

Inheritance diagram for OSGeo::FDO::Commands::Schema::IPhysicalElementMapping:

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## Detailed Description

IPhysicalElementMapping is an abstract interface that acts as a base interface for all Physical Schema Mapping Override classes. FDO also provides a number of sub-classes for particular types of Provider-specific override classes:.

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- `PhysicalClassMapping:` All classes corresponding to Feature Classes must be based on PhysicalClassMapping.
- `PhysicalPropertyMapping:` Must be the base for all classes corresponding to Properties.
- `PhysicalSchemaMapping:` Must be the base for all types of schema override sets.
- `Other` types of schema override classes can be based directly on PhysicalElementMapping.