Documentation for apex_app_builder_api package, or setting null in interactive reports

I am working on an existing apex application which uses the apex_app_builder_api package to create and maintain apex pages, and has created hundreds of reports which I am supporting. There is almost no documentation in Oracle for this package.

The specific issue I am investigating now is setting the null attribute when creating interactive reports using this package. Its set to display - the user would like it to be blank when null.

So please reply if you:

• Can point me to document on the apex_app_builder_api, specifically the create_ir_page function and the p_columns parameter.