Providing structured visualizations of expressions in an expressions editor

摘要

A computer readable storage medium comprises executable instructions to provide a workspace for a user to define an expression with expression components from a graphical palette associated with the workspace. Placeholders are indicated in the workspace for the expression components to be added by the user. The placeholders are associated with a data type. The data type is enforced for each placeholder. A structured visual representation of the expression is provided on the workspace.