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Cloned from launchpad blueprint https://blueprints.launchpad.net/nova/+spec/ec2-tags-api. Description: The EC2 API allows end users to 'tag' resources with arbitrary key-value pairs. This facility is also used by internal AWS tools such as autoscaling and cloudformation to group resources spawned by them. The openstack EC2 API implementation does not offer the tags related API calls DescribeTags, CreateTags, DeleteTags or the ability to filter resource searches by tags ("filter": [{ "tag:key": "value"}]} and {"filter": [{"tag-key": "value"}]}. The difficulty I see is that tags can be applied to many resource types, including ones handled by Quantum and Glance and so on. It is not clear to me if reusing the instance-metadata table (and creating a 'security-group-metadata and so on tables) is the best way, or if this should be done with a new table 'tags' that stores all tags and a reference to the resource. Specification URL (additional information): http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-CreateTags.html