It is possible to combine them up as you like. (You can use the two vocabularies with both of those syntaxes on exactly the same page. You can use each vocabularies with only one syntax. You might use just one vocabulary with both equally syntaxes, or with only one syntax. https://sabodacostaafricano62616.webbuzzfeed.com/32438702/considerations-to-know-about-json-schema-custom-message