XKV stands for X key value:
eXchangeable key value
eXtensible key value
eXclusive key value
eXtreme key value
Key value concept: “A key-value database, or key-value store, is a data storage paradigm designed for storing, retrieving, and managing associative arrays, a data structure more commonly known today as a dictionary or hash table.”
Source: https://en.wikipedia.org/wiki/Key-value_database
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