TS EN 9300-121
Aerospace series - LOTAR - LOng Term Archiving and Retrieval of digital technical product documentation such as 3D CAD and PDM data - Part 121: Semantic representation of CAD 3D Explicit Geometry with Product and Manufacturing Information
1.1 Introduction This document defines the requirements for the long term digital preservation of the Semantic Representation of Product and Manufacturing Information (PMI) with their possible links to the 3D explicit shape and geometry of single CAD parts. The goal is to preserve this 3D information, without loss, with respect to the geometry produced by the original CAD system, following the principles laid down in EN 9300 003 “Fundamentals and Concepts”. The requirements of EN 9300 110 concerning the preservation of the 3D explicit shape shall apply within this Part. The term “semantic representation” is defined in Clause 3 “Terms, definitions and abbreviations”. 1.2 In scope The following outlines the total scope of EN 9300 121: – machine-interpretable PMI “Semantic Representation” (Refer to clause 3 for definition); – the association of the above with 3D geometric shapes; – the possible association of the above with Presentation of 3D Product and Manufacturing Information (PMI), and 3D annotations as defined in EN 9300 120. In EN 9300 121, the technology used to preserve this 3D information is based on semantic representation. The main use cases are Certification, Product Liability and Design re-use. For the purpose of this document, the semantic definition is at the level that supports associative “Cross-highlighting” for the purpose of human readability. 1.3 Out of scope The following is outside the scope: – PMI presentation (defined in EN 9300 120); – User defined attributes that are assigned to 3D geometric entities or at the part level. The archiving of the UDA is defined in EN 9300 120. – How to preserve additional information: – – property rights; – – form features; – – CAD Assemblies. – The semantics of special Notes outside the scope of PMI: ITAR/EAR, proprietary, and title block information, etc.
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About This Item
TS EN 9300-121 is a LOTAR standard for aerospace digital technical product documentation, focused on the semantic representation of product and manufacturing information linked to 3D explicit CAD geometry. This part addresses how machine-interpretable PMI is preserved together with its association to the geometry of single CAD parts over the long term.
In general technical terms, PMI is the information layer that attaches product definition data such as dimensions, tolerances, surface treatment, or manufacturing intent to a 3D model. A semantic representation means that this information is stored as structured data that software can read and interpret, rather than as a purely visual annotation. That distinction matters in archiving because the meaning of the model must remain usable alongside the shape, not just visible on screen.
What this part keeps connected
- Machine-interpretable semantic PMI
- The link between PMI and 3D geometric shapes
- Possible association with PMI presentation and 3D annotations defined in EN 9300 120
- Application of EN 9300 110 requirements for preserving 3D explicit shape within this part
- Typical use cases such as certification, product liability, and design re-use
The standard’s preservation goal is to keep this 3D information without loss relative to the geometry produced by the original CAD system, following the LOTAR fundamentals and concepts. Its scope is intentionally narrower than full product-data archiving: PMI presentation, user-defined attributes, CAD assemblies, property-rights information, form features, and special notes outside PMI are excluded or handled elsewhere. That separation helps maintain a clear boundary between semantic product definition, graphical presentation, and other document content.
For aerospace organisations, this part is relevant when the archived model must support traceability, readable product definition, and later reuse in regulated or liability-sensitive contexts. It is not simply a geometry storage convention; it is about preserving the meaning attached to the geometry so the archived CAD data remains technically useful over time.
- Publication Date: 8.11.2023
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 01.110 Teknik Ürün Dökümantasyonu
- Pages: 21
- Source Standard: EN 9300-121:2023
- International Equivalents: EN 9300-121-EQV
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