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# Index

## Classes

| Name | Description
--- | --- | ---
| PDFCoordinateSystem | Defines the base class for spatial coordinate systems.
| PDFGeographicCoordinateSystem | Defines a geographic coordinate system.
| PDFGeospatialMeasure | Defines a geospatial measure.
| PDFMeasure | Defines the bae class for spatial PDF measures
| PDFNumberFormat | Defines how a measure units should be formatted for display.
| PDFNumberFormatCollection | Defines a collection of PDF number formats.
| PDFPointData | Defines a class that specifies extended geospatial data.
| PDFProjectedCoordinateSystem | Defines a projected coordinate system.
| PDFRectilinearMeasure | Defines a rectilinear measure.
| PDFViewport | Defines a rectangular region of a page that supports a different measurement scale.
| PDFViewportCollection | Defines a collection of PDF viewports.

## Enums

| Name | Description
--- | --- | ---
| PDFFractionDisplay | Specifies the supported display modes for a fractional value.
| PDFPointDataType | Specifies the supported types for values in a PDFPointData object.
| PDFPreferredDisplayUnit | Specifies the supported values for preferred display units.