Here are the data structures with brief descriptions:

cr_BinaryData
cr_ChangelogEntry
cr_CompressionTask
cr_ContentStat
cr_DeltaPackage
cr_DeltaTargetPackage
cr_Dependency
cr_DistroTag
cr_EVR
CR_FILE
cr_HeaderRangeStruct
cr_MetadataLocation
cr_ModifyRepoTask
cr_NEVR
cr_NEVRA
cr_Package
cr_PackageFile
cr_Repomd
cr_RepomdRecord
cr_RepomdRecordFillTask
cr_SqliteDb
cr_Statements
cr_UpdateCollection
cr_UpdateCollectionPackage
cr_UpdateInfo
cr_UpdateRecord
cr_UpdateReference
cr_Version
cr_XmlFile
cr_XmlStruct
PoolTask
UserData