[Len Case]

Originally Posted by zottel

... which brings me to another question:

Does anyone know more about .webarchives and how that format is actually defined? If it's really a representation of the internal browser model—will it work with future versions, where this model might change?

Since all of WebKit is now open source, you can look at the code for yourself and see exactly how webarchives are defined and created--and since they are including the full history in the public repository, you should always be able to read or write any version of webarchive were they to change them in the future.