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File metadata
File metadata is one of the most subtle requirements in Personal information management. It embeds data without relying too much on filesystem such as the file name, creation date, and modification date.
Each type of files have different ways of embedding metadata:
- Image files such as JPEG or PNG, metadata are embedded in Exchangeable image file format (EXIF).
- MP3 files have the ID3 as the de-facto standard for embedding contextual information such as the artist, album, genre, comments, and others.
- Vorbis comments is a universal format commonly found on OGG.
- HTML documents contain the
<head>element to store the metadata. - Org mode documents allow file-level properties that are functionally equivalent to embedded metadata.
There are also universal formats such as Extensible metadata platform (XMP) or Meta Information Encapsulation (MIE) available either as embedded or a separate file.
Beware about caring too much on metadata to the point of our metadata takes more space than the data themsevles. Cautionary tales such as MS Fnd in a Lbry have been written about it. They are, after all, merely data on data; if the referred data does not exist in the first place, might as well as the metadata.