2011

whereas Oracle supports XY, XYZ, XYZM, and XYM points. The default is
XY. Additionally, it can have attributes that describe elevation and measure:
HasElevation for Z and HasMeasure for M.
A feature class has one main geometry property, but can have additional
geometry properties. A geometry property is associated with a spatial context.
All instances of a geometric property must have the same ordinate
dimension. Not all providers support all geometry types or all
dimensionalities; SHP supports only XY points, for example, whereas Oracle
supports XY, XYZ, XYZM, and XYM points. The default is XY. Additionally,
it can have attributes that describe elevation and measure: HasElevation for
Z and HasMeasure for M.
The association property may appear in the list, but it is not supported by
AutoCAD Map 3D. Choose this property type only if existing data uses it
and you want to maintain that data after it is moved to a different data
store.
Description
Enter an optional description of the property.
System Generated
You cannot set this option, which indicates the current setting for this
property in an existing schema. Yes indicates that the system will
auto-generate values for this property. Generally, identifier properties whose
values identify each feature uniquely are auto-generated.
Data Attributes
Click an attribute name in the schema tree to display its description. If you
can change or specify the value for a property, a down-arrow or a blinking
cursor appears in its field and you can select or enter a value.
The list changes dynamically to show the different attributes that are
available for the selected property type.
NOTE The following caveats apply to certain providers:
■ You can constrain the default length of a string property in a SQLite
schema. However, AutoCAD Map 3D will not generate an error if the
constraints are violated. Such validation slows down the performance
of the data store. For example, you can constrain a string field to 2
characters and enter 3 characters without producing an error message.
AutoCAD Map 3D maintains the constraint information so that, for
example, bulk copying to another data provider will product the desired
constraint.
■ You cannot make SQLite properties read-only.
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