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Overview
Collection communication involves both messaging and data transmission. The messaging part is illustrate below 
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Sequence diagrams
Ckecksums
Evt. Checksumsalgoritme for checksummer
Evt. max antal checksummer i svarbesked
Specifikt for checksummer skal denne information indeholde:
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The sequence diagram for checks corresponds to last part of a get operattion. The sequence diagram is given below.
Checksum messages
The getChecksums message contains the same information as a get, except that it also must include:
- Checksums algorithm for checksums
In case we want to open possibility to give resulting checksums in a respons message then the following parameter must be included
- Optionally max count of checksummer in svarbesked
Furthermore we will need a getChecksumsReplyData message.
Checksum data to be transmitted
The data must as minimum include:
- Number of checksums included
- Repeatedly for each file:
- the file id
- the file checksum
- the time when the checksum was calculated (especially for off-line medias, there can be long inteervals between calculations, - in such cases this information is crucial for alarming)
File lists
Evt. max antal filer i svarbesked
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