Karen Coyle wrote: > As for defining "extent" as "extentType" in the physical description > area, note that extentType is very specifically about page numbers and > ranges, not extents in general. It has elements: > start > end > total > list > > and the examples are all about page numbers. So extentType really is > pageExtentType, and perhaps a more general extentType is needed (not > that I'm saying they have to have those names, I mean that conceptually). Thanks for clarifying this. Now I think that <extent> under <physicalDescription> just lacks a "unit" attribute. This can be mapped to MARC 21 field 300, subfield f (Type of unit). Where can you note such requests and comments? Something like a public wiki would be helpful. For instance I have an issue of a journal with number "5-6" - I'd like to add the note that the <number> element under part/detail does not have to include a numeric value. It's not very productive if such questions and comments are kept private or raised on the mailing list and forgotten afterwards, isn't it? Greetings, Jakob P.S: For METS there is a wiki, but I have not found the recent changes link: http://www.eu.socialtext.net/mim-2006/index.cgi?METS%20Wiki