Features
APE tags are more similar to Vorbis comments than ID3 tags. Like Vorbis comments, they are unstructured (key,value) pairs. However, unlike Vorbis comments, they do not allow for inter-key ordering. This is because they store a list of values for each key rather than one value per key.
APE values can be flagged as text, binary, or external types. This allows tag editing software to avoid incorrectly displaying binary values, such as an image of album cover art, in the form of unreadable text to users. In comparison, Vorbis comments do not have a flagging feature, so binary data cannot be easily stored in them (though this is by design).
APEv2 supports Unicode using UTF-8 for values. For keys, an ASCII subset (control characters from 0x00 to 0x1f are not allowed) must be used.
Read more about this topic: APE Tag
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