Schema
A schema is a formal description of the structure of data. Schemas have special meanings in relation to databases. A database schema includes all the objects that a privileged database user created. These objects include tables, views, synonyms, sequences, etc. and can be used by other users database, provided the schema owner has granted the privileges accordingly.
Usually, the schema itself is defined in a formal language so that the data can be automatically checked to see if it matches the schema. A well-known example of such a description language is XML Schema for XML, JSON Schema for JSON.
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