12/20/2023 0 Comments Cad step fileOften, one will find here the value _'2 1'_. The conformance option is either "1" for internal and "2" for external mapping of complex entity instances. Possible versions are "1" for the original standard back in 1994, "2" for the technical corrigendum in 1995 and "3" for the second edition. The version and conformance option of this file. Except for the data fields time_stamp and FILE_SCHEMA all fields may contain empty strings. The HEADER section has a fixed structure consisting of 3 to 6 groups in the given order. #19=APPLIED_ORGANIZATION_ASSIGNMENT(#10,#20,(#16)) Īs seen in the above example, the file is split into two sections following the initial keyword ISO-10303-21 : #12=APPLICATION_CONTEXT('mechanical design') #11=PRODUCT_DEFINITION_CONTEXT('part definition',#12,'manufacturing') * description */ ('A minimal AP214 example with a single part'),įILE_SCHEMA (('AUTOMOTIVE_DESIGN ')) In practice, however, most implementations only use a single data section (1st edition encoding). The 2nd edition allows multiple data sections to be used.In practice, however, short names are rarely used. The 1st edition of part 21 enforces the use of so-called short names, which are optional in the 2nd edition.In theory this would allow better AP interoperability, since a post-processor may know how to handle some supertypes, but may not know the specified subtypes. Conformance class 2, which is not used in practice, always enforces the external mapping.Conformance class 1 is always used enforce the so-called internal mapping, which is more compact.They differ only in how to encode complex entity instances. Part 21 defined two conformance classes.The third edition, ISO 10303-21:2016, added anchor, reference and signature sections to support external references, support for compressed exchange structures in a ZIP-based archive, digital signatures, and UTF-8 character encoding.The second edition, ISO 10303-21:2002, included the corrigendum and extensions for several data sections.Therefore, it is recommended that users study the second edition instead (see below). The first edition, ISO 10303-21:1994, had some bugs, which were corrected by a Technical Corrigendum.The Industry Foundation Classes and earlier CIMSteel Integration Standard (CIS/2) define an EXPRESS schema for building information modeling data and specify ISO 10303-21 as an exchange encoding. The use of ISO 10303-21 is not limited to STEP. p21 should be used for all other purposes. step indicate that the file contains data conforming to STEP application protocols while the extension. A STEP-File is also called p21-File and STEP Physical File. ISO 10303-21 defines the encoding mechanism for representing data conforming to a particular schema in the EXPRESS data modeling language specified in ISO 10303-11. The format of a STEP-file is defined in ISO 10303-21 Clear Text Encoding of the Exchange Structure. Due to its ASCII structure, a STEP-file is easy to read, with typically one instance per line. ISO 10303 can represent 3D objects in computer-aided design (CAD) and related information. STEP-file is a widely used data exchange form of STEP. Model/step, model/step+xml, model/step+zip, model/step-xml+zip
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