Concepts and Terminology
All language-specific OpenTracing APIs share core concepts and terminology. These concepts are so central and important to the project that they have their own repository (github.com/opentracing/specification) and semver scheme.
specification repository houses two important files:
specification.mdis a versioned description of the current pan-language OpenTracing standard
data_conventions.yamlis a structured YAML file describing standard Span tags and Span log keys
Both are versioned and the github repository is tagged according to the rules described by the versioning policy.