Hello guys, The LocalId attribute of the Extension class specified in page 8 of the GLUE 2.0 Specifications is of type LocalId_t. The LocalId_t is specified in page 72, which basically says that is must be a string that starts with a-zA-Z and the following characters can be into a-zA-Z_0-9. I am just curious to know why did you apply this restriction. I am sure there is a good reason behind it. Regards, David -- David Horat Software Engineer specialized in Grid and Web technologies IT Department – Grid Deployment Group CERN – European Organization for Nuclear Research » Where the web was born Phone +41 22 76 77996 http://davidhorat.com/ http://cern.ch/horat http://www.linkedin.com/in/davidhorat