Collection---Provider
DIF production
- Mercury: tool; Q&A to build DIF, can build DIF any other way (TECO, Perl, …) you can write text
- GCMD: Tools plus can write text.
- Relaxed requirements supported by both.
DIF use
- Mercury: page of files to harvest; manually created/maint., used nightly.
- GCMD: DIFs mailed, etc. Q&A, interned.