Hl7 Composites 1
Each segment of an HL7 message consists of one or more composites (also known as fields). By default, the | (pipe) character is used to separate one composite from another.
A composite can be a primitive data type (such as a character string or a number), or can contain other composites.
If a composite contains other composites, these sub-composites (or sub-fields) are normally separated by ^ characters.