1. Extracting Geometry from Digital Models in a Cultural Heritage Digital Library Thomas L. Milbank Perseus Project, Tufts University tmilbank@perseus.tufts.edu

2. Introduction Digital libraries can … »disseminate objects “as is” through cataloged metadata »disseminate objects customized to the user through automated processes

3. Models and libraries The treatment of models as immutable objects... »leads to in toto retrieval »impacts library search results

4. Paradigm: a search for column capitals

5. Models as texts Digital model of Boston 07.1002, a relief from tomb G 2110 at Giza,...  rendered in an image rendered in XML 

6. The Perseus document manager & X3D  X3D encoding of tomb G 2110 The Boston 07.1002 “Transform” is mapped and indexed as “object” Index of elements/mappings 

7. The Perseus document manager & X3D PDM references the index PDM opens the model and reads the sub-object(s) PDM processes the X3D fragment and outputs VRML for display in an HTML page

8.  Results of search for “Boston 07.1002”... … include sub-object  instantiations 

9.  Results of search for “Boston 07.1002”... … include sub-object  instantiations 

10. Implications for model design Need for well-defined and well-named geometry »Object-oriented modeling is suitable natively »Layer-oriented modeling is suitable with forethought

11. Conclusions XML processing techniques … »can be applied to digital models successfully »facilitate the identification of geometry incorporated into larger constructs »enable the extraction of sub-object geometry The application of XML processing techniques establishes a framework for the integration of models with additional library services

12. Visit the Perseus Digital Library at http://www.perseus.tufts.edu Thomas L. Milbank Perseus Project, Tufts University tmilbank@perseus.tufts.edu