Whole document tree
Chapter 2. Object Content in Documents
Terms and Concepts
In this document, "in-line" means "occuring within a line of text, like a character or character string, not causing a line break." This term is sometimes used to refer to objects such as an illustration around which something like a paragraph is wrapped; here that arrangement is called "in flow." There is no provision yet for indicating that an object is in flow, but one could make creative use of the Role attribute to do so.
A related point: formal objects have titles (with the possible exception of a formal equation, which doesn't require a title); informal objects do not. That an object is informal does not mean that it is in-line: these are two different characteristics.