syntaxproperty should be a syntactic regexp, that is a regexp that matches buffer data based on the current Emacs syntax table.
For instance, to grab constituents of
syntax property value will probably be:
For well known types, the
syntax property has a predefined
value that should suit standard needs (see Predefined well-known types).
matchdatatypeproperty is a symbol that specifies which algorithm to use to match the tokens of this type. These match algorithms are defined: