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rOCCI-core is a ruby-based implementation of the OCCI (Open Cloud Computing Interface) standard, currently released in version 1.1. rOCCI-core implements:

• classes defined by the OCCI Core model and methods for manipulating them
• methods for rendering JSON, plain-text or HTTP header representations of those classes' instances
• methods for basic parsing of such renderings

Built on top of rOCCI-core are the following products:

• rOCCI-api, implementing transport functions for rendered (r)OCCI queries
• rOCCI-cli, a command-line interface to communicate with OCCI-enabled services using the rOCCI-api
• rOCCI-server, a server to interpret OCCI-compliant communication, respond to queries and carry out actions on server side.

rOCCI-core is developed and maintained jointly by GWDG and CESNET.