X-Git-Url: http://git.nguyen.vg/gitweb/?a=blobdiff_plain;f=tag.ml;fp=tag.ml;h=82c42b5757db837779aecd0cbacb5380d07de142;hb=d64e3a3a9ef6329caafdba848ef78427fce0d689;hp=057f09dad9ee0c8e0bfee12e7a34b1e1f6e17b96;hpb=c74aa5a224a41d3ab9d1a7ae4ebb4e58083a578c;p=SXSI%2Fxpathcomp.git

diff --git a/tag.ml b/tag.ml
index 057f09d..82c42b5 100644
--- a/tag.ml
+++ b/tag.ml
@@ -35,6 +35,10 @@ let tag s = match s with
 
 let compare = (-)
 let equal = (==)
+
+let hash x = x
+
+
 let to_string t = 
   if t = pcdata then "<$>"
   else if t = attribute then "<@>"
@@ -42,3 +46,10 @@ let to_string t =
 
 
 let print ppf t = Format.fprintf ppf "%s" (to_string t)
+(* Check internal invariants *)
+let check t = 
+  if (t != tag (to_string t))
+  then failwith "module Tag: internal check failed"
+
+let dump = print
+