From OpenSCADAWiki
The property "Attribute" is the reflecting sign of the template I/O on the resulting attribute of the parameter. There the following options for this property are provided:
- No attribute — input/output of the template function does not reflect on the attribute;
- Read only — input/output of the template function reflects on the attribute with read-only access;
- Full access — input/output of the template function reflects on the attribute with full access.