Autodesk 15606-011408-9005 - MAP R6.3 NAMED-10U PK, Tutorials Manual, Page: 277 / 332

attributes—they are characteristics of all objects in the feature class. For
example, a Roads feature class property can specify the number of lanes it has,
or its speed limit. The values vary, but all Roads features have a speed limit
and a certain number of lanes.
You cannot change the schemas for all data source types, but you can edit the
schemas for SDF files. In this lesson, you edit an SDF schema to add a property
to the Roads feature class. The new property is constrained, so only certain
values are valid for it.
NOTE This exercise uses the map you modified in Exercise 2: Connect to the new
SDF data (page 264).
Properties that are constrained to ranges of values
You can specify that only values within a particular range are valid. You can
include or exclude each extreme of the range: the lowest possible value and
the highest. For example, you can make a range 1 - 100 inclusive. You can
specify a range of any value higher than 1 and lower than 100, but not 1 or
100. You can specify any combination.
To add a property to the Roads feature class that is constrained by range
1 Switch the Task pane to Map Explorer.
2 Select the SDF data source at the top of the pane.
3 Click Schema
➤
Edit Schema.
Edit the SDF schema.
Exercise 4: Add a property | 269