fromDataItem

Creates a ZkDocumentData instance from a CBOR DataItem.

This factory method deserializes a CBOR representation back into a ZkDocumentData object. It validates and extracts all required fields from the CBOR map structure.

Expected CBOR structure:

• "id": Required text string for the ZK system specification ID

• "docType": Required text string for the document type

• "timestamp": Required text string in ISO-8601 format

• "issuerSignedItems": Optional array of DataItems (defaults to empty list)

• "deviceSignedItems": Optional array of DataItems (defaults to empty list)

• "msoX5chain": Required X.509 certificate chain

Parameters

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