Restructure XFST sources

Change-Id: I92c899a124caf724cc782cd168a96252e81ce832
diff --git a/src/entities.xfst b/src/entities.xfst
index f185e31..a5b3149 100644
--- a/src/entities.xfst
+++ b/src/entities.xfst
@@ -2,4 +2,4 @@
 define XMLentitiesHex ["#" ["x"|"X"] HexLetter HexLetter+ ];
 define XMLentitiesStr [[[AsciiLetter .o. Caseinsensitive].l | Digit | "_" | "-" ] ];
 
-read regex ["&" [XMLentitiesDec|XMLentitiesHex|XMLentitiesStr XMLentitiesStr+] ";"];
\ No newline at end of file
+define XMLEntities ["&" [XMLentitiesDec|XMLentitiesHex|XMLentitiesStr XMLentitiesStr+] ";"];
\ No newline at end of file