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More details on initial research:
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Problem
Integrations with different tools from Blockchain ecosystem required additional changes in Iroha 1.0 and Михаил Болдыревwith Andrei Lebedevhad to build more levels of abstractions to support them.
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The idea behind DM or HL Transact is to decouple business logic from the blockchain. It will allow to run Iroha with a subset of ISIs required for a specific deployment, or solely with Burrow EVM, or WASM as business logic layer, for example.
Solution
A data model (further referred to as DM) is a business model abstraction. It may provide interfaces to execute some commands and query some state. A DM implementation is a module that can be attached to an Iroha node. In that case, the set of commands delivered to a DM module is strictly determined by the ledger, which enables to build extensible blockchain applications.
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