Field Specifications
Example: (from MarcArticleRules.ini)
field* = 600(sep='BREAK',trl='BREAK')|\
a,b,c,r,n,o,x,y,z(idx='sh=',sep=' -- ',trl='BREAK',repeatFldid=a)
field* = 610,650,651(sep='BREAK',trl='BREAK')|\
a,b,x,y,z(idx='sh=',sep=' --',trl='BREAK',dataordered,repeatFldid=a)
field* = 690(sep='BREAK',trl='BREAK')|\
a(idx='sh=',sep=' -- ',trl='BREAK',repeatFldid=a)