"... (A) tuplespace is a shared datastore (the space) for simple list data structures (tuples). A very simple model is used to access the tuplespace, usually consisting of the operations write (out), take (in), read (rd) ..." "... An XML-space is a tuple-space made up only of XML-tuples--that is, a public repository or buffer that can contain XML-tuples. An XML-space has a name, by which it is referenced, and it is hosted on a server, along with any number of other (and other-named) XML-spaces ..." 1hca 1hca_s1 Zn Tetrahedral ]]> http://earl.strain.at/space/Tuple%20Spaces http://uncled.oit.unc.edu/XML/XMLSpaces.html