About Creating Label Format Strings
There are two types of format string: a simple text string and a special text string. The special text string uses special characters to reference parameters of an object.
To create a special string use special characters, such as { } [ ] ( ) ! , \ and the following syntax:
• To access parameters of an object to which the label is associated, the parameter name must be enclosed with < > (angle brackets). An accessor is the string before the !. The standard accessors are container, sheet, and design, but there is no restriction on including other accessors in the label class.
• By default, the angle bracket method accesses parameters on the object with which the label is associated. However, you can access parameters of other objects. They must be related to the object you are annotating.
• Accessors are not user-configurable.
• To undo the effect of the < > angle brackets and include them as part of the text, use a \ (backslash).
• To include a backslash as part of text, add another backslash to it (\\) to undo the effect of the special character.