afishbeck/HPCC-Platform — comment on commit 320df407bc5c1c24cdb4fb95dd4802842a913c2c
File: ecl/hql/hqlgram.y line 613
By ghalliday:

We almost never use STRING_CONST in productions, but allow arbitrary expressions. That way parameters can be passed, or defined as attributes (e.g., root directory).