Hi folks, A new wiki page has been created to present a proposal for artf6187 - constraint specification ( http://forge.gridforum.org/sf/go/artf6187 ) http://forge.ogf.org/sf/wiki/do/viewPage/projects.jsdl-wg/wiki/ParameterSwee... As usual I'm unsure as to whether I've used the optimum xml schema to achieve the aim, in particular attempting (unsuccesfully so far) to use xsd:unique on the variableName attribute. As a side-effect the option to introduce constraints would also allow the emulation of at least one form of self-modifying sweep ( http://forge.gridforum.org/sf/go/artf6151?nav=1 ). gef