On lines 9 and 10, we see an example of string constant concatenation. On line 11, we see a SymOid reference, linking back to the atomic object defined in line 5. Finally, on line 13 we see an example of using a quoted string to identify a label. The semantics of these optional values remains unspecified at this point, since none are integral to OEM per se. A full grammar is provided as a reference.
Identifiers are case sensitive.
The standard C definition of a string constant. Standard C definitions for such constants.