diff --git a/src/include/storage/predicate.h b/src/include/storage/predicate.h
index d071c21..7dcc2af 100644
--- a/src/include/storage/predicate.h
+++ b/src/include/storage/predicate.h
@@ -1,7 +1,7 @@
 /*-------------------------------------------------------------------------
  *
  * predicate.h
- *	  POSTGRES predicate locking definitions.
+ *	  POSTGRES public predicate locking definitions.
  *
  *
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
@@ -14,137 +14,15 @@
 #ifndef PREDICATE_H
 #define PREDICATE_H
 
-#include "access/htup.h"
-#include "storage/lock.h"
 #include "utils/relcache.h"
 #include "utils/snapshot.h"
 
-/* GUC variables */
+
+/*
+ * GUC variables
+ */
 extern int	max_predicate_locks_per_xact;
 
-/*
- * The SERIALIZABLEXACTTAG struct identifies a serializable transaction.
- */
-typedef struct SERIALIZABLEXACTTAG
-{
-	VirtualTransactionId vxid;	/* We always have one of these. */
-} SERIALIZABLEXACTTAG;
-
-/*
- * Information needed for each serializable database transaction to support SSI techniques.
- * TODO SSI: Should inConflict and outConflict be lists?  That would allow us to reduce
- *			 false positives, *and* would allow us to guarantee that an immediate retry
- *			 of a transaction would never fail on the exact same conflicts.
- *			 The RAM doesn't look like it would be the limiting factor, but CPU time might
- *			 be -- we should have baseline benchmarks before attempting this.
- */
-typedef struct SERIALIZABLEXACT
-{
-	/* hash key */
-	SERIALIZABLEXACTTAG tag;
-
-	/* data */
-	struct SERIALIZABLEXACT *outConflict;		/* ptr to write transaction
-												 * whose data we couldn't
-												 * read. invalid means no
-												 * conflict; self-reference
-												 * means multiple or
-												 * committed. */
-	struct SERIALIZABLEXACT *inConflict;		/* ptr to read transaction
-												 * which couldn't see our
-												 * write. invalid means no
-												 * conflict; self-reference
-												 * means multiple or
-												 * committed. */
-	TransactionId topXid;		/* top level xid for the transaction, if one
-								 * exists */
-	TransactionId finishedBefore;		/* invalid means still running; else
-										 * the struct expires when no tags <
-										 * this. */
-	TransactionId xmin;			/* the transaction's snapshot xmin */
-	SHM_QUEUE	predicateLocks; /* list of associated PREDICATELOCK objects */
-	SHM_QUEUE	xids;			/* list of associated SERIALIZABLEXID objects */
-	SHM_QUEUE	finishedLink;	/* list link in
-								 * FinishedSerializableTransactions */
-	bool		rolledBack;		/* ignore conflicts when true; allows deferred
-								 * cleanup */
-} SERIALIZABLEXACT;
-
-
-typedef enum PredicateLockTargetType
-{
-	PREDLOCKTAG_RELATION,
-	PREDLOCKTAG_PAGE,
-	PREDLOCKTAG_TUPLE
-	/* TODO Other types may be needed for index locking */
-}	PredicateLockTargetType;
-
-/*
- * The PREDICATELOCKTARGETTAG struct is defined to fit into 16
- * bytes with no padding.  Note that this would need adjustment if we were
- * to widen Oid or BlockNumber to more than 32 bits.
- */
-typedef struct PREDICATELOCKTARGETTAG
-{
-	uint32		locktag_field1; /* a 32-bit ID field */
-	uint32		locktag_field2; /* a 32-bit ID field */
-	uint32		locktag_field3; /* a 32-bit ID field */
-	uint16		locktag_field4; /* a 16-bit ID field */
-	uint16		locktag_field5; /* a 16-bit ID field */
-} PREDICATELOCKTARGETTAG;
-
-/*
- * These macros define how we map logical IDs of lockable objects into
- * the physical fields of PREDICATELOCKTARGETTAG.	Use these to set up values,
- * rather than accessing the fields directly.  Note multiple eval of target!
- *
- * TODO SSI: If we always use the same fields for the same type of value,
- * we should rename these.	Holding off until it's clear there are no exceptions.
- * Since indexes are relations with blocks and tuples, it's looking likely that
- * the rename will be possible.  If not, we may need to divide the last field
- * and use part of it for a target type, so that we know how to interpret the
- * data..
- */
-#define SET_PREDICATELOCKTARGETTAG_RELATION(locktag,dboid,reloid) \
-	((locktag).locktag_field1 = (dboid), \
-	 (locktag).locktag_field2 = (reloid), \
-	 (locktag).locktag_field3 = InvalidBlockNumber, \
-	 (locktag).locktag_field4 = InvalidOffsetNumber, \
-	 (locktag).locktag_field5 = 0)
-
-#define SET_PREDICATELOCKTARGETTAG_PAGE(locktag,dboid,reloid,blocknum) \
-	((locktag).locktag_field1 = (dboid), \
-	 (locktag).locktag_field2 = (reloid), \
-	 (locktag).locktag_field3 = (blocknum), \
-	 (locktag).locktag_field4 = InvalidOffsetNumber, \
-	 (locktag).locktag_field5 = 0)
-
-#define SET_PREDICATELOCKTARGETTAG_TUPLE(locktag,dboid,reloid,blocknum,offnum) \
-	((locktag).locktag_field1 = (dboid), \
-	 (locktag).locktag_field2 = (reloid), \
-	 (locktag).locktag_field3 = (blocknum), \
-	 (locktag).locktag_field4 = (offnum), \
-	 (locktag).locktag_field5 = 0)
-
-#define GET_PREDICATELOCKTARGETTAG_DB(locktag) \
-	((locktag).locktag_field1)
-#define GET_PREDICATELOCKTARGETTAG_RELATION(locktag) \
-	((locktag).locktag_field2)
-#define GET_PREDICATELOCKTARGETTAG_PAGE(locktag) \
-	((locktag).locktag_field3)
-#define GET_PREDICATELOCKTARGETTAG_OFFSET(locktag) \
-	((locktag).locktag_field4)
-#define GET_PREDICATELOCKTARGETTAG_TYPE(locktag)							 \
-	(((locktag).locktag_field4 != InvalidOffsetNumber) ? PREDLOCKTAG_TUPLE : \
-	 (((locktag).locktag_field3 != InvalidBlockNumber) ? PREDLOCKTAG_PAGE :   \
-	  PREDLOCKTAG_RELATION))
-
-typedef struct PredicateLockData
-{
-	int			nelements;
-	PREDICATELOCKTARGETTAG *locktags;
-	SERIALIZABLEXACT *xacts;
-} PredicateLockData;
 
 /*
  * function prototypes
@@ -155,7 +33,6 @@ extern void InitPredicateLocks(void);
 extern Size PredicateLockShmemSize(void);
 
 /* predicate lock reporting */
-extern PredicateLockData *GetPredicateLockStatusData(void);
 extern bool PageIsPredicateLocked(const Relation relation, const BlockNumber blkno);
 
 /* predicate lock maintenance */