Implementation of a Token Instrument, which is a simple instrument whose economic terms on the ledger are represented by an
idand a textual
Signatory: depository, issuer
Field Type Description depository Party The instrument’s depository. issuer Party The instrument’s issuer. id Id The intrument’s identifier. version Text A textual instrument version. description Text A description of the instrument. validAsOf Time Timestamp as of which the instrument is valid. This usually coincides with the timestamp of the event that creates the instrument. It usually does not coincide with ledger time. observers PartiesMap Observers.