Create a New Expression-Defined Property: Step By Step

  1. Open Property Manager (Options > Property Manager).
  2. Create a New Property.
  3. In the Value Definition panel, activate Expression. The Expression Editor dialog appears.

    CreateExpression.png
  4. Define the Expression with the help of the pop-up lists: Parameters & Properties; Units; Functions.

    ExpressionEditoPopups.png
  5. Double-click any item in these lists to add it to the Expressions Editor

    For example, start with a Function: Use CONCAT to “concatenate” (or join) multiple string-type data items into a single item.

    Data types of Parameters and Properties are indicated by their icon:


    DataTypeIcons.png

    See the Examples below to get the idea: Expression-Defined Properties: Examples.

    For information on how each parameter works, see: Element Listing Parameters.

  6. In the Value Definition panel, choose a Data Type that corresponds to the property expression. Note the Data Types that have unit values: Length, Area, Volume, Angle. (The program will help you choose the right ones – see the following section on Context-Sensitive Help.)

    DataTypeValueList.png
  7. Don’t forget to set Availability for Classifications when you define a new Property!
  8. Check the generated Property value as needed.

    See Evaluate Expression-Defined Property.