With the exceptions described below, white space is used as a delimiter, and is otherwise ignored. HDML also supports comments. In order to disambiguate between syntactic elements and the contents of the decks and cards, HDML uses SGML character and entity references to allow you to quote special characters. The following table lists the available references. Options Many of the syntactic elements of HDML have option lists associated with them.
Options refine the operation of the elements they are part of.
Options that are not defined for an element are ignored. An option list contains zero or more options. Each option is a key and a value. Options be given in any order within the list of options. The key is always an alpha-numeric name that is case insensitive.