Patent ID: 7222122

Claim:
A non-volatile recording medium including a database interrogation arrangement for use in relation to a database of data items classified according to a classification structure, in which a user is able to select a classification level within the structure, and is presented, in response to the selection, with a results table having at least two dimensions, one of the dimensions providing classification headings at the selected level of the structure, and another dimension representing classified additional identification of the content of data items within the headings provided, each point of the table showing at least the number of data items within the corresponding heading and having content relevant to the corresponding additional identification wherein a user to whom the classification headings of a level of the classification structure have been presented is able to select the next lower level by selecting one of the headings presented wherein the user is provided with a results table at each level per selection wherein said results table presents all classification headings which are at the selected level and which are sub-headings, within the classification structure, of a common heading at the next higher level wherein the said additional identification provided in a results table is different according to the chosen level.