> For the complete documentation index, see [llms.txt](https://docs.ogf.org/glue-2-1-test/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ogf.org/glue-2-1-test/master.md). # GLUE Specification v 2.1 (test copy) GFD-R-P.xxx **Authors:** Category: Recommendation Alessandro Paolini°, EGI Foundation GLUE Working Group Baptiste Grenier°, EGI Foundation Enol Fernandez°, EGI Foundation Paolo Andreetto°, INFN-PADOVA Marco Verlato°, INFN-PADOVA Stephen Burke, RAL Shiraz Memon\*, FZJ JP Navarro\*, ANL \*co-chairs °editor Jul 13th, 2018 Status of This Document This document provides information to the Grid community regarding the specification of the GLUE information model. Distribution is unlimited. Copyright Notice Copyright © Open Grid Forum (2009, 2019). All Rights Reserved. Trademark Open Grid Services Architecture and OGSA are trademarks of the Open Grid Forum. Replaces This document obsoletes GFD-R-P-147. Abstract The GLUE specification is an information model for Grid entities described using the natural language and UML Class Diagrams. As a conceptual model, it is designed to be independent from the concrete data models adopted for its implementation. This document defines the GLUE 2.1 model by extending the GLUE 2.0 model to include Cloud resources and services. Rendering to concrete data models such XML Schema, LDAP Schema and SQL are provided in a separate document.