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What is a schema?

What is a schema? Here are some definitions.

Noun
  1. An outline or image universally applicable to a general conception, under which it is likely to be presented to the mind (for example, a body schema).
  2. (databases) A formal description of the structure of a database: the names of the tables, the names of the columns of each table, and the data type and other attributes of each column.
  3. (markup languages) A formal description of data, data types, and data file structures, such as XML schemas for XML files.
  4. (logic) A formula in the language of an axiomatic system, in which one or more schematic variables appear, which stand for any term or subformula of the system, which may or may not be required to satisfy certain conditions.
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Examples
Their readings have roots in and derive their stimulus from historical and political schema of dissent outlined in the biblical narratives.
The family operates as a cognitive schema, which is mostly doxic, that is, invisible, naturalised and taken for granted.
While Johnnie certainly has a goal here, he is without a plan or a schema of how to achieve it.
The database schema needs to be developed in tandem with pseudocode, so that you don't wind up with orphaned code or database calls that are excessively resource-intensive.
In only one romance is the original language a Celtic language, and that is rather late in the schema of this material.
In addition, a completely new data type, such as pictures or sounds, could be added to the database without disturbing the schema simply by defining a new table.

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