Implicit format
In a group with an implicit format, the components are distinguishable not by delimiter or position, but by their pattern; something in the definition of the component types themselves. The group has no syntax property that distinguishes one component from another.
For example, the type File consists of Record(s). <CR><LF> appears at the end of each Record. It has been defined as the terminator of Record. File, however, has no syntax of its own. The Record terminator distinguishes one Record from another.
To specify that a group has an implicit format, choose Implicit for the Format property. Optionally, define a comment type, and choose the group's syntax: Delimited or None.