Leaving aside marine uses of this acronym (Sea Date Required to Load), a SDRL is a Data/Document Requirements List for a Supplier, Subcontract, or Subcontractor. Pretty much all the same thing: data deliverables under a contract. See also Contract Data Requirements List.
Compliance means “meeting all mandatory requirements,” and it’s the second-most important thing in RFP responses.
Clients write “statements” that describe what they want to contract for (services, products, data, reports, processes, standards), ranging from high-level, conceptual documents down to highly detailed specifications.
Submission mandatories are documents that must be present, or conditions that must be met, for the proposal to proceed to the technical evaluation stage.