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A STEP-file is ASCII text with the format defined in ISO 10303-21 Clear Text Encoding of the Exchange Structure. [2] 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. A STEP-File is also called p21-File and STEP Physical File.
ISO 10303 is an ISO standard for the computer-interpretable representation and exchange of product manufacturing information. It is an ASCII -based format. [ 1 ] : 59 Its official title is: Automation systems and integration — Product data representation and exchange .
ISO 10303-21: Data exchange form of STEP with an ASCII structure; ISO 10303-22: Standard data access interface, part of the implementation methods of STEP; ISO 10303-28: STEP-XML specifies the use of the Extensible Markup Language (XML) to represent EXPRESS schema; ISO 13584-24: The logical model of PLIB is specified in EXPRESS; ISO 13399: ISO ...
STEP - also known as ISO 10303-21 - has both advantages and disadvantages over IDF. If both MCAD and ECAD software support STEP, both programs can interchange more detailed models (at the cost of increased file size). Step models that are rendered correctly in the ECAD software can cause problems in the MCAD [citation needed].
It is a very comprehensive set of specifications covering many different product types and many life cycle phases. STEP uses the neutral ISO 10303-11 format, also known as an EXPRESS schema. EXPRESS defines not only the data types but also relations and rules applying to them. [5] STEP supports data exchange, data sharing and data archiving ...
STEP-XML specifies the use of the Extensible Markup Language to represent EXPRESS schema (ISO 10303-11) and the data that is governed by those EXPRESS schema. It is an alternative method to STEP-File for the exchange of data according to ISO 10303. The following specifications are within the scope of ISO 10303-28:
Until 1982, STP was defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 1 atm (101.325 kPa). Since 1982, STP has been defined as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 1 bar (100 kPa, 10 5 Pa).
ISO 10303-22 is a part of the implementation methods of STEP with the official title Standard data access interface or simply SDAI. SDAI defines an abstract Application Programming Interface (API) to work on application data according to a given data models defined in EXPRESS. SDAI itself is defined independent of a particular programming language.