Abstract Elements and Types
The abstract
attribute applies to type and element declarations. When it is
set to true, that element or type
cannot appear directly in an instance document. If an element is
declared as abstract, a member of a substitution group based on that
element must appear. If a type is declared as abstract, no element
declared with that type may appear in an instance document.
Get XML in a Nutshell, 3rd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
