A Rendering Syntax Type can now have "variants" which represent variations of the base syntax. For example markdown+github is the GitHub-Flavored Markdown Syntax, markdown+commonmark is the CommonMark Markdown Syntax, etc. It used to be a best practice to use the + character to separate variants. It's now official and part of the API with some constructors and getters. For example:

SyntaxType syntaxType = new SyntaxType("id", Arrays.asList("variant1", "variant2"), "name");
assertThat(syntaxType.getVariants(), contains("variant1", "variant2"));

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