The Filter tab sheet in the data frame displays a filter tree within a subframe as a standard interface for initiating queries. It is a branching diagram of the table's fields and of links to related tables. Clicking a button will display the field structure of a related table. A click on the plus sign beside any item displays fields and filter subtrees below the item.

A non-functional example can be accessed in the navigation frame via the projects tab sheet. Select the "BSM Collection Bryophytes" item and open this project in the context menu (right mouse bottom). (In the current version, access to the items in the subtree is disabled.) Subsequently select the Filter tab sheet in the data frame.

• Defining queries: If there are no saved queries or a predefined query with the necessary search criteria, one can create a new query. To launch a new query, the subframe filter tree has to be accessed. When a data field in the filter tree is selected, a query form appears in a data frame. The query form can be used to define a search expression. (to be implemented)
• Opening and saving queries. If one desires to receive data as a report, he/she needs to use a predefined query that already has a report format associated with that query. (to be implemented)
• Performing a query to one or simultaneously to more than one database within a project: Selection criteria list (Display – Sort – Field Name – Not – Operator – Criteria). (to be implemented)
• Interactive identification in connection with a DiversityDescription compatible database. (to be implemented)