(4) A set of bits or characters that identifies various conditions about data in a file and is often found in the header records of such files. This type of tag identifies the entire file, and the tags occupy predefined locations in the header rather than embedded throughout the file.
(5) A name (label, mnemonic) assigned to a data structure, such as a field or record. See XML document.
(6) A descriptive field in a music or video file. See ID3 tag.
(7) A field that identifies the contents of a data record. See key field.
(8) A brass pin on a terminal block that is connected to a wire by soldering or wire wrapping.
