= PostgreSQL Global Development Group
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The <PostgreSQL Global Development Group> is the collective project attribution used for the development and documentation of <PostgreSQL>, an open-source <database management system>. Its documentation specifies concrete behavior for <database transactions>, <database integrity constraints>, <database query> operations and storage mechanisms; these specifications are more precise than inferring behavior from <SQL> syntax alone.<Concepts in the PostgreSQL documentation>[§2.2, PostgreSQL client/server organization]{ref}
For example, PostgreSQL documents <transaction isolation> levels in terms of visible snapshots and permitted anomalies. The project name here identifies the responsible development community, rather than one individual author or a separate database product.
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