diff --git a/include/tidyenum.h b/include/tidyenum.h
index 643284b..3ef0298 100644
--- a/include/tidyenum.h
+++ b/include/tidyenum.h
@@ -802,16 +802,6 @@ typedef enum
   /* MathML <math> attributes */
   TidyAttr_DISPLAY,             /**< DISPLAY= (html5) */
 
-  /* RDFa global attributes */
-  TidyAttr_ABOUT,             /**< ABOUT= */
-  TidyAttr_DATATYPE,          /**< DATATYPE= */
-  TidyAttr_INLIST,            /**< INLIST= */
-  TidyAttr_PREFIX,            /**< PREFIX= */
-  TidyAttr_PROPERTY,          /**< PROPERTY= */
-  TidyAttr_RESOURCE,          /**< RESOURCE= */
-  TidyAttr_TYPEOF,            /**< TYPEOF= */
-  TidyAttr_VOCAB,             /**< VOCAB= */
-
   N_TIDY_ATTRIBS              /**< Must be last */
 } TidyAttrId;
 
diff --git a/src/attrs.c b/src/attrs.c
index 3e67889..a2b5ccf 100644
--- a/src/attrs.c
+++ b/src/attrs.c
@@ -47,9 +47,6 @@ static AttrCheck CheckScroll;
 static AttrCheck CheckTextDir;
 static AttrCheck CheckLang;
 static AttrCheck CheckType;
-static AttrCheck CheckRDFaSafeCURIE;
-static AttrCheck CheckRDFaTerm;
-static AttrCheck CheckRDFaPrefix;
 
 #define CH_PCDATA      NULL
 #define CH_CHARSET     NULL
@@ -88,11 +85,6 @@ static AttrCheck CheckRDFaPrefix;
 #define CH_TARGET      CheckTarget
 #define CH_VTYPE       CheckVType
 #define CH_ACTION      CheckAction
-#define CH_RDFAPREFIX  CheckRDFaPrefix
-#define CH_RDFASCURIE  CheckRDFaSafeCURIE
-#define CH_RDFASCURIES CheckRDFaSafeCURIE
-#define CH_RDFATERM    CheckRDFaTerm
-#define CH_RDFATERMS   CheckRDFaTerm
 
 static const Attribute attribute_defs [] =
 {
@@ -425,16 +417,6 @@ static const Attribute attribute_defs [] =
 #endif
   { TidyAttr_DISPLAY,                  "display",                 CH_PCDATA   }, /* on MATH tag (html5) */
 
-  /* RDFa Attributes */
-  { TidyAttr_ABOUT,             "about",                 CH_RDFASCURIE },
-  { TidyAttr_DATATYPE,          "datatype",              CH_RDFATERM   },
-  { TidyAttr_INLIST,            "inlist",                CH_BOOL       },
-  { TidyAttr_PREFIX,            "prefix",                CH_RDFAPREFIX },
-  { TidyAttr_PROPERTY,          "property",              CH_RDFATERMS  },
-  { TidyAttr_RESOURCE,          "resource",              CH_RDFASCURIE },
-  { TidyAttr_TYPEOF,            "typeof",                CH_RDFATERMS  },
-  { TidyAttr_VOCAB,             "vocab",                 CH_URL        },
-
   /* this must be the final entry */
   { N_TIDY_ATTRIBS,             NULL,                    NULL         }
 };
@@ -450,32 +432,6 @@ static uint AttributeVersions(Node* node, AttVal* attval)
             return (XH50 | HT50);
         if (strcmp(attval->attribute,"allowfullscreen") == 0)
             return (XH50 | HT50);
-        /* RDFa global attributes */
-        if (strcmp(attval->attribute,"about") == 0)
-            return (XH50 | HT50);
-        if (strcmp(attval->attribute,"datatype") == 0)
-            return (XH50 | HT50);
-        if (strcmp(attval->attribute,"inlist") == 0)
-            return (XH50 | HT50);
-        if (strcmp(attval->attribute,"prefix") == 0)
-            return (XH50 | HT50);
-        if (strcmp(attval->attribute,"property") == 0)
-            return (XH50 | HT50);
-        if (strcmp(attval->attribute,"resource") == 0)
-            return (XH50 | HT50);
-        if (strcmp(attval->attribute,"typeof") == 0)
-            return (XH50 | HT50);
-        if (strcmp(attval->attribute,"vocab") == 0)
-            return (XH50 | HT50);
-        /* Override the settings on these attributes because
-         * they are allowed everywhere by RDFa */
-        if (strcmp(attval->attribute,"content") == 0)
-            return (XH50 | HT50);
-        if (strcmp(attval->attribute,"rel") == 0)
-            return (XH50 | HT50);
-        if (strcmp(attval->attribute,"rev") == 0)
-            return (XH50 | HT50);
-
     }
     /* TODO: maybe this should return VERS_PROPRIETARY instead? */
     if (!attval || !attval->dict)
@@ -2197,97 +2153,6 @@ AttVal *SortAttVal( AttVal *list, TidyAttrSortStrategy strat)
     }
 }
 
-/* RDFA support checkers
- *
- */
-
-/* CheckRDFAPrefix - ensure the prefix attribute value is
- * correct
- *
- * @prefix takes prefix value pairs in the form:
- * 
- *      NCName ':' ' '+ AnyURI
- */
-
-void CheckRDFaPrefix ( TidyDocImpl* doc, Node *node, AttVal *attval)
-{
-    if (!AttrHasValue(attval))
-    {
-        TY_(ReportAttrError)( doc, node, attval, MISSING_ATTR_VALUE);
-        return;
-    }
-
-    /* Copy the attribute value so we can split it */
-    if (attval->value) {
-        uint prefixCount = 0;
-        /* isPrefix toggles - start at 1 and change to 0 as we
-         * iterate over the components of the value */
-        uint isPrefix = 1;
-
-        /* Copy it over */
-
-        uint len = TY_(tmbstrlen)(attval->value);
-        tmbstr s = (tmbstr) TidyDocAlloc( doc, len );
-        s[0] = '\0';
-        TY_(tmbstrcpy)( s, attval->value );
-
-        /* iterate over value */
-        tmbstr tPtr = s;
-
-        tmbstr t;
-        while ( ( t = strtok(tPtr, " ") ) != NULL ) {
-            tPtr = NULL;
-            if (isPrefix) {
-                /* this piece should be a prefix */
-                /* prefix rules are that it can have any
-                 * character except a colon - that one must be
-                 * at the end */
-                tmbstr i = index(t, ':') ;
-                if (i == NULL) {
-                    /* no colon - bad! */
-                    TY_(ReportAttrError)( doc, node, attval, BAD_ATTRIBUTE_VALUE);
-                } else if (i != ( t + TY_(tmbstrlen)(t) - 1) ) {
-                    /* not at the end - also bad */
-                    TY_(ReportAttrError)( doc, node, attval, BAD_ATTRIBUTE_VALUE);
-                }
-            } else {
-                /* this piece should be a URL */
-                prefixCount ++;
-            }
-            isPrefix = !isPrefix;
-        }
-        TidyDocFree( doc, s ) ;
-    }
-}
-
-/* CheckRDFaTerm - are terms valid
- *
- */
-
-void CheckRDFaTerm ( TidyDocImpl* doc, Node *node, AttVal *attval)
-{
-    if (!AttrHasValue(attval))
-    {
-        TY_(ReportAttrError)( doc, node, attval, MISSING_ATTR_VALUE);
-        return;
-    }
-
-}
-
-/* CheckRDFaSafeCURIE - is a CURIE legal
- *
- */
-
-void CheckRDFaSafeCURIE ( TidyDocImpl* doc, Node *node, AttVal *attval)
-{
-    if (!AttrHasValue(attval))
-    {
-        TY_(ReportAttrError)( doc, node, attval, MISSING_ATTR_VALUE);
-        return;
-    }
-
-}
-
 /*
  * local variables:
  * mode: c
diff --git a/src/attrs.h b/src/attrs.h
index c01bd44..2a70faf 100644
--- a/src/attrs.h
+++ b/src/attrs.h
@@ -12,7 +12,6 @@
 
 /* declaration for methods that check attribute values */
 typedef void (AttrCheck)(TidyDocImpl* doc, Node *node, AttVal *attval);
-typedef void (AttrCheckEx)(TidyDocImpl* doc, Node *node, AttVal *attval, uint limit);
 
 struct _Attribute
 {