The Rule Base Editor allows users to write, modify, browse, and test business rules based on XBRL 2.1 Formula linkbase.

Rule Base Editor screen shot
Both taxonomies and instance document are loaded and the business rules which associate with these taxonomies are shown.
Rule Base Editor can create, modify, and browse business rules.
Formulas can be created by dragging and dropping elements.
Descriptions on rules can be generated automatically based on rules.
Rule Base Editor can evaluate and debug business rules. The operation check for the created Formula Link is also available.
You can also edit taxonomy for calculation result output.
Instance documents with business rules applied can be saved.
XBRL data receivers including:
The following shows examples on the usage of the created formula linkbase:
This realizes real-time validation of input values and error location indication.
The created Formula Link can be used in server-side systems using Fujitsu's Formula Link Engine.

Screen shot of Formula Link used on Online Instance Creator