Layer metadata in CS3

[myranalis]

I have a project where I want to track some information about each layer in the document. I'd like this to work in CS3 and from what I gather the layer level metadata isn't avail in CS3 - correct? (Pity - that would make life easy.) and I don't want to put the information in the layer name. So I am thinking I will need to have a hash table that gets updated as layers are removed/added. When the document is saved and closed the contents of the hash are written out somewhere for future reference. Maybe the internal photoshop indexes are a suitable candidate for linking the hash records to the layers if they are static enough?. And I'd rather store the contents inside the PSD so it doesn't get lost. Either a hidden text layer, or in the FileInfo would be acceptable.

Has anyone done something like this for CS3 and care to share any pointers?

[Mike Hale]

I have not done that in CS3 but I think I would work out some XML structure for the data I needed to save and save the XML as a string in document.info.instructions.

That way the data stays with the image.