Contents 1 History 2 ISO 10303-21 Building blocks 2.1 Example 2.2 HEADER section 2.3 DATA section 3 See also 4 References


History[edit] Some details to take note of: The first edition, ISO 10303-21:1994, had some bugs, which were corrected by a Technical Corrigendum. Therefore, it is recommended that users study the second edition instead (see below). The second edition, ISO 10303-21:2002, included the corrigendum and extensions for several data sections. 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.[3] Part 21 defined two conformance classes. They differ only in how to encode complex entity instances. Conformance class 1 is always used enforce the so-called internal mapping, which is more compact. Conformance class 2, which is not used in practice, always enforces the external mapping. In theory this would allow better AP interoperability, since a postprocessor may know how to handle some supertypes, but may not know the specified subtypes. The 1st edition of part 21 enforces the use of so-called SHORT NAMES, which are optional in the 2nd edition. In practice, however, SHORT NAMES are rarely used. The 2nd edition allows multiple data sections to be used. In practice, however, most implementations only use a single data section (1st edition encoding).


ISO 10303-21 Building blocks[edit] Example[edit] A typical example looks like this: ISO-10303-21; HEADER; FILE_DESCRIPTION( /* description */ ('A minimal AP214 example with a single part'), /* implementation_level */ '2;1'); FILE_NAME( /* name */ 'demo', /* time_stamp */ '2003-12-27T11:57:53', /* author */ ('Lothar Klein'), /* organization */ ('LKSoft'), /* preprocessor_version */ ' ', /* originating_system */ 'IDA-STEP', /* authorization */ ' '); FILE_SCHEMA (('AUTOMOTIVE_DESIGN { 1 0 10303 214 2 1 1}')); ENDSEC; DATA; #10=ORGANIZATION('O0001','LKSoft','company'); #11=PRODUCT_DEFINITION_CONTEXT('part definition',#12,'manufacturing'); #12=APPLICATION_CONTEXT('mechanical design'); #13=APPLICATION_PROTOCOL_DEFINITION('','automotive_design',2003,#12); #14=PRODUCT_DEFINITION('0',$,#15,#11); #15=PRODUCT_DEFINITION_FORMATION('1',$,#16); #16=PRODUCT('A0001','Test Part 1','',(#18)); #17=PRODUCT_RELATED_PRODUCT_CATEGORY('part',$,(#16)); #18=PRODUCT_CONTEXT('',#12,''); #19=APPLIED_ORGANIZATION_ASSIGNMENT(#10,#20,(#16)); #20=ORGANIZATION_ROLE('id owner'); ENDSEC; END-ISO-10303-21; HEADER section[edit] As seen in the above example, the file is split into two sections following the initial keyword ISO-10303-21;: The HEADER section has a fixed structure consisting of 3 to 6 groups in the given order. Except for the data fields time_stamp and FILE_SCHEMA all fields may contain empty strings. FILE_DESCRIPTION description implementation_level. The version and conformance option of this file. 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 conformance option is either "1" for internal and "2" for external mapping of complex entity instances. Often, one will find here the value __'2;1'__. The value '2;2' enforcing external mapping is also possible but only very rarely used. The values '3;1' and '3;2' indicate extended STEP-Files as defined in the 2001 standard with several DATA sections, multiple schemas and FILE_POPULATION support. FILE_NAME name of this exchange structure. It may correspond to the name of the file in a file system or reflect data in this file. There is no strict rule how to use this field. time_stamp indicates the time when this file was created. The time is given in the international data time format ISO 8601, e.g. 2003-12-27T11:57:53 for 27 of December 2003, 2 minutes to noon time. author the name and mailing address of the person creating this exchange structure organization the organization to whom the person belongs to preprocessor_version the name of the system and its version which produces this STEP-file originating_system the name of the system and its version which originally created the information contained in this STEP-file. authorization the name and mailing address of the person who authorized this file. FILE_SCHEMA. Specifies one or several Express schema governing the information in the data section(s). For first edition files, only one EXPRESS schema together with an optional ASN.1 object identifier of the schema version can be listed here. Second edition files may specify several EXPRESS schema. The last three header groups are only valid in second edition files. FILE_POPULATION, indicating a valid population (set of entity instances) which conforms to an EXPRESS schemas. This is done by collecting data from several data_sections and referenced instances from other data sections. governing_schema, the EXPRESS schema to which the indicated population belongs to and by which it can be validated. determination_method to figure out which instances belong to the population. Three methods are predefined: SECTION_BOUNDARY, INCLUDE_ALL_COMPATIBLE, and INCLUDE_REFERENCED. governed_sections, the data sections whose entity instances fully belongs to the population. The concept of FILE_POPULATION is very close to schema_instance of SDAI. Unfortunately, during the standardization process, it was not possible to come to an agreement to merge these concepts. Therefore, JSDAI adds further attributes to FILE_POPULATION as intelligent comments to cover all missing information from schema_instance. This is supported for both import and export. SECTION_LANGUAGE allows assignment of a default language for either all or a specific data section. This is needed for those Express schemas that do not provide the capability to specify in which language string attributes of entities such as name and description are given. SECTION_CONTEXT provide the capability to specify additional context information for all or single data sections. This can be used e.g. for STEP-APs to indicate which conformance class is covered by a particular data section. DATA section[edit] The DATA section contains application data according to one specific express schema. The encoding of this data follows some simple principles. Instance name: Every entity instance in the exchange structure is given a unique name in the form "#1234". The instance name must consist of a positive number (>0) and is typically smaller than 263. The instance name is only valid locally within the STEP-file. If the same content is exported again from a system the instance names may be different for the same instances. The instance name is also used to reference other entity instances through attribute values or aggregate members. The referenced instance may be defined before or after the current instance. Instances of single entity data types are represented by writing the name of the entity in capital letters and then followed by the attribute values in the defined order within parentheses. See e.g. "#16=PRODUCT(...)" above. Instances of complex entity data types are represented in the STEP file by using either the internal mapping or the external mapping. External mapping has always to be used if the complex entity instance consist of more than one leaf entity. In this case all the single entity instance values are given independently from each other in alphabetical order as defined above with all entity values grouped together in parentheses. Internal mapping is used by default for conformance option 1 when the complex entity instance consists of only one leaf entity. The encoding is similar to the one of a single entity instance with the additional order given by the subtype definition. Mapping of attribute values: Only explicit attributes get mapped. Inverse, Derived and re-declared attributes are not listed since their values can be deduced from the other ones. Unset attribute values are given as "$". Explicit attributes which got re-declared as derived in a subtype are encoded as "*" in the position of the supertype attribute. Mapping of other data types: Enumeration, boolean and logical values are given in capital letters with a leading and trailing dot such as ".TRUE.". String values are given in " ". For characters with a code greater than 126 a special encoding is used. The character sets as defined in ISO 8859 and 10646 are supported. Note that typical 8 (e.g. west European) or 16 (Unicode) bit character sets cannot directly be taken for STEP-file strings. They have to be decoded in a very special way. Integers and real values are used identical to typical programming languages Binary values (bit sequences) are encoded as hexadecimal and surrounded by double quotes, with a leading character indicating the number of unused bits (0, 1, 2, or 3) followed by uppercase hexadecimal encoding of data. It is important to note that the entire binary value is encoded as a single hexadecimal number, with the highest order bits in the first hex character and the lowest order bits in the last one. The elements of aggregates (SET, BAG, LIST, ARRAY) are given in parentheses, separated by ",". Care has to be taken for select data types based on defined data types. Here the name of the defined data type gets mapped too. See also "Mapping of Express to Java" for more details of this.[clarification needed]


See also[edit] Industry Foundation Classes (IFC) IGES STL (file format)


References[edit] ^ ISO 10303-21:2002 Industrial automation systems and integration -- Product data representation and exchange -- Part 21: Implementation methods: Clear text encoding of the exchange structure ^ ISO TC184/SC4 Secretary "Cumulative list of resolutions" Resolution 583 (Stuttgart, Germany, - June 2003) "Registration of SC4 MIME-Types", [1] ^ ISO 10303-21:2016. Industrial automation systems and integration -- Product data representation and exchange -- Part 21: Implementation methods: Clear text encoding of the exchange structure [2] v t e ISO standards by standard number List of ISO standards / ISO romanizations / IEC standards 1–9999 1 2 3 4 5 6 7 9 16 31 -0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 128 216 217 226 228 233 259 269 302 306 428 518 519 639 -1 -2 -3 -5 -6 646 690 732 764 843 898 965 1000 1004 1007 1073-1 1413 1538 1745 1989 2014 2015 2022 2047 2108 2145 2146 2240 2281 2709 2711 2788 2848 2852 3029 3103 3166 -1 -2 -3 3297 3307 3602 3864 3901 3977 4031 4157 4217 4909 5218 5428 5775 5776 5800 5964 6166 6344 6346 6385 6425 6429 6438 6523 6709 7001 7002 7098 7185 7200 7498 7736 7810 7811 7812 7813 7816 8000 8178 8217 8571 8583 8601 8632 8652 8691 8807 8820-5 8859 -1 -2 -3 -4 -5 -6 -7 -8 -8-I -9 -10 -11 -12 -13 -14 -15 -16 8879 9000/9001 9075 9126 9293 9241 9362 9407 9506 9529 9564 9594 9660 9897 9899 9945 9984 9985 9995 10000–19999 10005 10006 10007 10116 10118-3 10160 10161 10165 10179 10206 10218 10303 -11 -21 -22 -28 -238 10383 10487 10585 10589 10646 10664 10746 10861 10957 10962 10967 11073 11170 11179 11404 11544 11783 11784 11785 11801 11898 11940 (-2) 11941 11941 (TR) 11992 12006 12182 12207 12234-2 13211 -1 -2 13216 13250 13399 13406-2 13450 13485 13490 13567 13568 13584 13616 14000 14031 14224 14289 14396 14443 14496 -2 -3 -6 -10 -11 -12 -14 -17 -20 14644 14649 14651 14698 14750 14764 14882 14971 15022 15189 15288 15291 15292 15398 15408 15444 -3 15445 15438 15504 15511 15686 15693 15706 -2 15707 15897 15919 15924 15926 15926 WIP 15930 16023 16262 16612-2 16750 16949 (TS) 17024 17025 17100 17203 17369 17442 17799 18000 18004 18014 18245 18629 18916 19005 19011 19092 (-1 -2) 19114 19115 19125 19136 19439 19500 19501 19502 19503 19505 19506 19507 19508 19509 19510 19600:2014 19752 19757 19770 19775-1 19794-5 19831 20000+ 20000 20022 20121 20400 21000 21047 21500 21827:2002 22000 23270 23271 23360 24517 24613 24617 24707 25178 25964 26000 26300 26324 27000 series 27000 27001 27002 27006 27729 28000 29110 29148 29199-2 29500 30170 31000 32000 38500 40500 42010 55000 80000 -1 -2 -3 Category Retrieved from "https://en.wikipedia.org/w/index.php?title=ISO_10303-21&oldid=811834350" Categories: ISO 10303Hidden categories: All articles with unsourced statementsArticles with unsourced statements from October 2014Wikipedia articles needing clarification from January 2014


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