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6.3 Functions

— version-satisfies: version version-spec

Does version satisfy the version-spec. A generic function. ASDF provides built-in methods for version being a component or string. version-spec should be a string.

In the wild, we typically see version numbering only on components of type system.

For more information about how version-satisfies interprets version strings and specifications, see The defsystem grammar and Common attributes of components.