...
A wireframe is underway and will be based on the spreadsheet with sample data.
Here are some useful links:
Categories for the Description of Works of Art Place/Location Authority (Getty Research Institute)
http://www.getty.edu/research/publications/electronic_publications/cdwa/30place.html
Visual Resource Association (VRA) Core 4.0 (Library of Congress)
http://www.loc.gov/standards/vracore/schemas.html
Taxonomic Databases Working Group (TDWG) Introduction to Darwin Core
TDWG Darwin Core Quick Reference Guide: Location Terms
http://rs.tdwg.org/dwc/terms/index.htm#locationindex
GADM Database of Global Administrative Areas
Please send comments and questions to chris.hoffman@berkeley.edu or post on the work or talk lists.