스프링 스터디

validation-api를 추가하려고 아래 메이븐 사이트에 들어갔더니

( http://mvnrepository.com/artifact/javax.validation/validation-api )

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Version Type Download
1.1.0.Alpha1 alpha Binary (52 KB)
1.0.0.GA general availability Binary (47 KB)
1.0.CR5 release candidate Binary (45 KB)
1.0.CR4 release candidate Binary (45 KB)
1.0.CR3 release candidate Binary (44 KB)
1.0.CR2 release candidate Binary (40 KB)
1.0.CR1 release candidate Binary (40 KB)
1.0.Beta4 beta Binary (37 KB)
1.0.Beta3
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이렇게 되어 있네요
Alpha1, GA, CR5, CR4 이런것들이 있는데
이게 의미하는게 뭔지 잘 모르겠네요

혹시 알고 계신분 있을까요?