====== 15.4 Logical Data Structures Remain Distinct from Serialisation Formats ======
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A [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_data_structure_definition|Logical Data Structure Definition]] describes the structure, meaning, and constraints of an information class at the platform-independent logical level. It does not represent an IDL structure, a Protocol Buffers message, a JSON Schema definition, an XML Schema definition, an Avro schema, an OpenAPI schema, a database table, an ontology class, a generated type, a file, or a wire-format payload.

Implementation profiles select data representation mechanisms that realize [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_data_structure_definition|Logical Data Structure Definitions]] and [[dido:99_annexes:annex-b-terms-and-definitions:l:logical_data_structure_instance|Logical Data Structure Instances]]. The selected representation supports implementation, exchange, storage, validation, or processing. It does not redefine the logical information structure.

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