SharePoint GUID: uppercase or lowercase?

Does it matter that I use lowercase or uppercase letters in GUID for Sharepoint development? I'm not sure if there are certain situations where lowercase letters need to be used instead of uppercase ones.

Th开发者_如何学Pythonanks.

It shouldn't matter what casing you are using, though most people tend to use uppercase in SharePoint-development.

It could matter though, if curly brackets are used or not. I'm not sure if this bug has been fixed in the service packs but here's a small article on the brackets:

http://www.andrewconnell.com/blog/archive/2007/10/26/To-bracket-or-not-to-bracket-GUIDs-in-SharePoint-CAML.aspx

No it does not matter. All GUIDs are created equally (harhar)