diff --git a/mse.pegjs b/mse.pegjs
index fe1357e..0e2eced 100644
--- a/mse.pegjs
+++ b/mse.pegjs
@@ -10,21 +10,23 @@ AttributeNode = OPEN n:SIMPLENAME vals:(ValueNode *) CLOSE {return {name:n, vals
 ValueNode = Primitive / Reference / ElementNode
 Primitive = STRING / NUMBER / Boolean
 Boolean = TRUE / FALSE
-Reference = IntegerReference / NameReference
+Reference = IntegerReference / NameReference / TypeReference
 IntegerReference = OPEN REF i:INTEGER CLOSE {return {ref:i}}
 NameReference = OPEN REF e:ELEMENTNAME CLOSE {return {ref:e}}
+TypeReference = OPEN REF t:TYPENAME CLOSE {return {ref:t}}
 OPEN = _ "(" _ 
 CLOSE = _ ")" _
 ID = _ t:"id:" _ {return t}
 REF = _ t:"ref:" _ {return t}
 TRUE = _ t:"true" _ {return t}
 FALSE = _ t:"false" _ {return t} 
-ELEMENTNAME = _ letter ( letter / digit ) * ( "." letter ( letter / digit ) * ) _  {return text().trim()}
-SIMPLENAME = _ letter ( letter / digit ) * _  {return text().trim()}
-INTEGER = _ digit + _ {return text().trim()}
+ELEMENTNAME "ElementName" = _ letter ( letter / digit ) * ( "." letter ( letter / digit ) * ) _  {return text().trim()}
+SIMPLENAME "Simplename" = _ letter ( letter / digit ) * _  {return text().trim()}
+TYPENAME "Typename" = 'Object' / 'Number' / 'Boolean' / 'String' 
+INTEGER "Integer" = _ digit + _ {return text().trim()}
 NUMBER = _ "-" ? digit + ( "." digit + ) ? ( ( "e" / "E" ) ( "-" / "+" ) ? digit + ) ? _ {return text().trim()}
 STRING = _ ( "\'" [^'] * "\'" ) + _ {return text().trim()}
 letter = [A-Za-z]
 digit = [0-9]
 _ = space*
-space = [ \t\n\r]
\ No newline at end of file
+space "whitespace" = [ \t\n\r]
\ No newline at end of file