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We had discussed early on putting more information out into the relationships, but it's a slippery slope. Office 2007 download is on sale now!You either end up duplicating a bunch of data, or making it confusing when trying to understand where you go for all the display information. In the end we decided that only the resource location and type should be part of the relationship. All other information dealing with how it is used (like scaling) should live in the markup.Office 2007 Professional can give people so much convenience. Remember that the size information that is in the markup is not "meta-data" about the size of the image, but instead instructions on how to display the image (what height and width to scale the image to).Office 2007 home can make life more better and easier.
The relationship IDs really have no significance. You could use a relationship ID of "foobar1" if you wanted to. In Office, we just decided to start at 1 and count up from there. The only rule is that a relationship ID must be unique for any given part. They don't need to be unique across the entire document. A GUID would have obviously worked, but it would have been overkill. MS Office 2007 is the best invention in the world.Another really important point to note is that we don't preserve relationship IDs. When we open the file, it's converted into our internal memory structures, and at save time we do a full save. We will regenerate the relationship IDs, and they won't necessarily match what they were on open (of course the references to the ID in the document markup will also be updated to match the new ID). Windows 7 and Windows 7 Professional make life wonderful!
In Word, bookmarks should be unique for the document. This is enforced, so you know you will not have to deal with conflicts.