07/03/03 48821 CTB Converted to XML format This relation is used for all products for an OPUS association. It identifies the exposures contained in each product. It can also be accessed to find the products association with any exposure. The other relations used to describe OPUS associationa are ASN_ASSOCIATION and ASN_MEMBERS C3 When a proposal is accepted into the PMDB by SPSS it must be assigned a unique 3 character base 36 program identifier. This is done by the PMDB/ACCEPT_PROP command. This program identifier is tagged as 'program_id' in most PMDB relations. Is is used for identification of proposals by spacecraft and OPUS software. It is also used in the OPUS and DADS rootname for all archived science data files. Because of flight design software, program_id must be three characters. C2 Association observation set identifier. An observation set is identified by a 2 character base 36 string. This field, typically called 'obset_id', will often contribute to the index on relation together with a proposal_id, version_num, and possibly other fields. OBSET is an abbreviation for observation set. C3 BASE_36 Member number (in asn_members) of the product: it is the association number (two characters) plus the product_id. C2 Exposure observation set identifier. An observation set is identified by a 2 character base 36 string. This field, typically called 'obset_id', will often contribute to the index on relation together with a proposal_id, version_num, and possibly other fields. OBSET is an abbreviation for observation set. C2 BASE_36 Observations are numbered sequentially throughout an observation set and are assigned by SMS/Gen. An ob_number is _NOT_ the same as an obset_ID. This field can be joined to member_num for exposure records in asn_members. ASN_LNK_TYPE Association Members Relation OPUS DADS unique clustered nonclustered