1. Database integration Piccard, WILC, WZMA, NIKI

2. Common to all 4 databases Watermarks: Reference number Motif group (category) Date (if available) Source Height Distance of chainlines

3. Examples for differences Width of watermark not in WILC Number of chainlines not in Piccard and NIKI Maker not in WZMA Begin-Date + End-Date not in WILC

4. Proposal for a new database Object oriented approach vs. hierarchical categorisation Class hierarchy: Object: Composition or Element Composition: Objects + spatial Relation spatial Rel.: e.g. TopBottom, LeftRight, Inside Element e.g. Head ->Bullhead, Mouth, Horns

5. Class hierarchy (1)

6. Class hierarchy (2)

7. Class hierarchy (3)

8. Example watermark Bullhead + Cross + Crown

9. Example watermark instance

10. Example watermark in XML Bullhead with Eyes and Horns

11. Requirements for suggested new database Export from existing 4 databases Watermarks and categories Images ? Specification of class hierarchy Define Mapping of each category to classes Import to new database Mapping to class hierarchy (automatically) Additional attributes for each watermark (manually)