+ end-glyph-layout The layout policy of the extent's end glyph.
+
+ syntax-table A cons or a syntax table object. If a cons, the car must
+ be an integer (interpreted as a syntax code, applicable to
+ all characters in the extent). Otherwise, syntax of
+ characters in the extent is looked up in the syntax table.
+ You should use the text property API to manipulate this
+ property. (This may be required in the future.)