'IDEOGRAPHIC SPACE' (U+3000) in DSL fails

When DSL contains '　' (='IDEOGRAPHIC SPACE' (U+3000)), DSLMapLexer fails with "DSL lexer error" (Internally, it's a NoViableAltException). IDEOGRAPHIC SPACE is commonly used in Japan so please allow it to use. It doesn't mean that I want to use IDEOGRAPHIC SPACE as an alternative to ASCII whitespace. Just to use it as same as usual unicode characters.