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Partition type has no central registry, but with 16 bytes it is unlikely that there'll ever be a collusioncollision. You can find types for OSes on their corresponding corporation's website (for MacOSX see Apple; for Windows see Microsoft etc.)
 
Attributes is a bit set. Bit 1 (attrib & 1) means that the partition is required by the firmware and should not be touched. [[EFI System Partition]] would be a good example, however that's always explicitly assumed to have this bit set. Bit 2 (attrib & 2) means that the partition contains necessary files to boot an operating system (defined as EFI_PART_USED_BY_OS). This is somewhat similar to 0x80 boot flag for MBR partitions, but not entirely.