GLUE, which stands for Grid Laboratory Uniform Environment, is a technology-agnostic information model for a uniform representation of Grid resources.

GLUE 1.3

GLUE 1.3, which resulted from a collaboration effort between the DataTAG and US-iVDGL, Globus, and the EDG projects. There is a concrete document with the usage of this specification within the EGEE project.

GLUE 2.0

GLUE 2.0 is provided by the Open Grid Forum GLUE Working Group, which is composed by people from several organizations spread worldwide such as CERN

CERN

The European Organization for Nuclear Research , known as CERN , is an international organization whose purpose is to operate the world's largest particle physics laboratory, which is situated in the northwest suburbs of Geneva on the Franco–Swiss border...

.

Currently there are several implementations being developed in LDAP, XML

XML

Extensible Markup Language is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards....

 and SQL

SQL

SQL is a programming language designed for managing data in relational database management systems ....

formats.