HowToAddAFormat

Become familiar with editing wiki pages in general. If you just want to try it out, you can do so in the OOModels:Sandbox.
If you don't already have, create an account and login (Why do I need an account?).
Let's assume your format is named MyFormat.
Find a suitable namespace for the format. If it's your or your company's format, you might just want to use your reverse domain name. Let's assume that's 'com/example'. If you want to add or document a well known format (like UML) choose a domain name carefully, use official sites, xml schema URIs or alike as your guide.
Create a wiki page named Type:com/example/MyType. You can do so by linking to yonder page with a wiki link, like here in this sentence. You can also just type the respective URL in your browser http://www.oomodels.org/wiki/index.php/Type:com/example/MyType (learn more about wiki page names)
Now you can create a type from scratch, or you can just copy&paste the wiki code from an existing type page (e.g. Type:org/omg/XMI) and adopt it to your needs.
optionally create a variant subpage, and/or optionally create a version subpage (use existing examples for copy&paste, like Type:org/omg/XMI/2.1)

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