REFER TO: 3.2.1 Data Characters
ESSENTIAL ASSERT: Each reference to one of the general entities defined in the HTML DTD maps to a single-character string.
Foo & Bar
Foo & bar
Foo ö bar @@ exhaustively enumerate these.
abc<def
abc<def
REQUIRED ASSERT: The terminating semicolon on entity or numeric character references is only necessary when the character following the reference would otherwise be recognized as part of the name
abc < def
abc < def