Canonicalization
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Cryptographic operations like hashing and signing depend on that the target data does not change during serialization. With ZML we have no need to canonicalize the data in order to yield a consistent form, because
the ZML standard cares for a canonical serialization of data objects.

In order to support consistent hashing of ZML documents for persistence into distributed hash tables (f.e. the IPFS merkledag) the canonical form allows unique content ids (CID standard).