4.3.1 DATA TRANSFORMATIONS IN THE PRODUCER ENTITY
The data within the data Producer entity are private and may be in any format the Producer desires. However, when the decision is made to store the data in an OAIS, the Producer who is responsible for the data meets with archivists to negotiate a Submission Agreement as discussed in 2.3.2 of this document. This agreement defines information such as the content, format, and scheduled arrival times of the Submission Information Package (SIP). The SIP is an Information Package that is provided to the OAIS by the Producer. The SIP consists of the Content Information plus the data that is necessary to assure that those data can be maintained by the OAIS and that the data can be interpreted and used by Consumers who withdraw them from the OAIS in the future.
These SIPs are periodically transferred to the OAIS in a Data Submission Session. The number of Data Submission Sessions between an OAIS and a Producer can range from a single session in the transfer of a final data product to multiple sessions a day in the case of active OAIS which store data for experiments which are still in process. The Data Submission Session can be logically viewed as sets of content Data Objects and description objects, although physically the description can be included in the digital objects (i.e., self- describing objects) or divided into many separate descriptive items. In addition to the logical view of data (the SIP), the specification of a data delivery session must also include the mapping of the objects to the media on which they are delivered. This mapping includes the encoding of the object and description and the allocation of logical objects to files