2011

Table Of Contents
NOTE This functionality affects geospatial feature data only. For information about
linking records in an external database to objects in a drawing, see
Overview of
Linking Database Records to Objects
(page 522). For information about moving
data between DWG and SDF format, see
Migrating DWG Data to GIS (page 628).
Characteristics of the SDF File Format
The SDF file format has the following characteristics:
SDF files can be read on different platforms.
One
schema (page 2073) in a single SDF file supports multiple feature classes
(page 2063).
SDF files have their own spatial indexing.
SDF files can store geometric and non-geometric data with minimal
overhead.
The SDF file format supports a single writer at any time, with multiple
readers.
What SDF Schemas Support
An SDF schema can support the following:
Auto ID generation
Default values
Exclusive and inclusive value range constraints
Value list constraints
Null value constraints
Spatial contexts
The following geometry types:
Polygons: polygon, multi-polygon, curve polygon, multi-curve polygon,
circular arc segment
Points: point, multi-point
Rings: ring, linear ring
Line strings: line string, line string segment, multi-line string, curve
string, multi-curve string
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