(registered 2021-07-20, last updated 2021-07-20) Media type name: application Media subtype name: p21+zip Required parameters: none Optional parameters: none Encoding considerations: binary Security considerations: This media type does not allow for any kind of executable or active content and is nonextensible. As such, the data elements currently defined in ISO 10303-21 do not in themselves create security risks beyond the information disclosed, since the elements are not used to induce any behavior by the recipient software application. Security considerations that apply to application/zip also apply to this media type. Interoperability considerations: This media describes only the structure and syntax of an exchange format. The semantics is given by an EXPRESS schema which is referenced in the header section of an exchange file. Published specification: The specification is published as ISO 10303-21. The most recent specification is available from the ISO website or from National standardization bodies for a nominal fee. Applications which use this media: Applications that display, create, edit, import, or export models, where the models are specified in the EXPRESS language, encoded in the exchange syntax defined in ISO 10303- 21, and compressed as ZIP, use this media type. While the ISO 10303-21 syntax is also used in model/step+zip, models specified with application/p21+zip are not limited to schemas defined in ISO 10303. Fragment identifier considerations: none Restrictions on usage: none Additional information: 1. Deprecated alias names for this type: n/a 2. Magic number(s): n/a 3. File extension(s): .stpz 4. Macintosh file type code: n/a 5. Object Identifiers: n/a General Comments: The ISO standard that specifies this type is available at: https://www.iso.org/standard/63141.html?browse=tc Person to contact for further information: 1. Name: Dana Tripp 2. Email: trippdsc4&gmail.com Intended usage: Common Author/Change controller: Committee Manager, ISO/TC 184/SC 4 - Industrial Data