you are responsible for a group of drafting technicians who each have
access to the same data, for example, the network of water mains
shown below. You want to make sure that everyone in your group enters
one of the standard values for the DIAMETER field when drafting
new pipes. 6”, 8”, or 10” are the only values allowed. In AutoCAD
Map 3D, you can do this by setting a constraint for
To set a constraint,
you edit the schema for the data source. After you have done this
for a particular property, for example for DIAMETER, the following things
- When one of your team uses the Data Table
to add attribute data for a new pipe feature, the DIAMETER field
will contain a pop-up list of acceptable values for the diameter.
- If he or she does not see the list and
enters some other value, an error message will appear that lists
the acceptable values.