diff --git a/src/runtime/c/pgf/data.h b/src/runtime/c/pgf/data.h
index 563e443ce..4bd31e47b 100644
--- a/src/runtime/c/pgf/data.h
+++ b/src/runtime/c/pgf/data.h
@@ -106,6 +106,9 @@ typedef struct {
 
 struct PGF_INTERNAL_DECL PgfConcrLincat {
     size_t ref_count;
+
+    ref<PgfAbsCat> abscat;
+
     ref<Vector<ref<PgfText>>> fields;
     PgfText name;
 
diff --git a/src/runtime/c/pgf/pgf.cxx b/src/runtime/c/pgf/pgf.cxx
index c8310ba2b..dccd8c394 100644
--- a/src/runtime/c/pgf/pgf.cxx
+++ b/src/runtime/c/pgf/pgf.cxx
@@ -955,6 +955,56 @@ void pgf_drop_concrete(PgfDB *db, PgfRevision revision,
     } PGF_API_END
 }
 
+PGF_API
+void pgf_create_lincat(PgfDB *db,
+                       PgfRevision revision, PgfConcrRevision cnc_revision,
+                       PgfText *name, size_t n_fields, PgfExn *err)
+{
+    PGF_API_BEGIN {
+        DB_scope scope(db, WRITER_SCOPE);
+
+        ref<PgfPGF> pgf = PgfDB::revision2pgf(revision);
+        ref<PgfConcr> concr = PgfDB::revision2concr(cnc_revision);
+
+        ref<PgfAbsCat> abscat =
+            namespace_lookup(pgf->abstract.cats, name);
+        if (abscat == 0) {
+            throw pgf_error("There is no corresponding category in the abstract syntax");
+        }
+
+        ref<PgfConcrLincat> lincat = PgfDB::malloc<PgfConcrLincat>(name->size+1);
+        memcpy(&lincat->name, name, sizeof(PgfText)+name->size+1);
+        lincat->ref_count = 1;
+        lincat->abscat = abscat;
+        lincat->fields = vector_new<ref<PgfText>>(n_fields);
+
+        for (size_t i = 0; i < n_fields; i++) {
+        }
+
+        Namespace<PgfConcrLincat> lincats =
+            namespace_insert(concr->lincats, lincat);
+        namespace_release(concr->lincats);
+        concr->lincats = lincats;
+    } PGF_API_END
+}
+
+PGF_API
+void pgf_drop_lincat(PgfDB *db,
+                     PgfConcrRevision revision,
+                     PgfText *name, PgfExn *err)
+{
+    PGF_API_BEGIN {
+        DB_scope scope(db, WRITER_SCOPE);
+
+        ref<PgfConcr> concr = PgfDB::revision2concr(revision);
+
+        Namespace<PgfConcrLincat> lincats =
+            namespace_delete(concr->lincats, name);
+        namespace_release(concr->lincats);
+        concr->lincats = lincats;
+    } PGF_API_END
+}
+
 PGF_API
 void pgf_create_lin(PgfDB *db,
                     PgfRevision revision, PgfConcrRevision cnc_revision,
@@ -996,6 +1046,41 @@ void pgf_create_lin(PgfDB *db,
     } PGF_API_END
 }
 
+PGF_API
+void pgf_drop_lin(PgfDB *db,
+                  PgfConcrRevision revision,
+                  PgfText *name, PgfExn *err)
+{
+    PGF_API_BEGIN {
+        DB_scope scope(db, WRITER_SCOPE);
+
+        ref<PgfConcr> concr = PgfDB::revision2concr(revision);
+
+        Namespace<PgfConcrLin> lins =
+            namespace_delete(concr->lins, name);
+        namespace_release(concr->lins);
+        concr->lins = lins;
+    } PGF_API_END
+}
+
+PGF_API
+int pgf_has_linearization(PgfDB *db, PgfConcrRevision revision,
+                          PgfText *name, PgfExn *err)
+{
+    PGF_API_BEGIN {
+        DB_scope scope(db, READER_SCOPE);
+
+        ref<PgfConcr> concr = PgfDB::revision2concr(revision);
+
+        ref<PgfConcrLin> lin =
+            namespace_lookup(concr->lins, name);
+
+        return (lin != 0);
+    } PGF_API_END
+
+    return 0;
+}
+
 PGF_API
 PgfLiteral pgf_get_global_flag(PgfDB *db, PgfRevision revision,
                                PgfText *name,
diff --git a/src/runtime/c/pgf/pgf.h b/src/runtime/c/pgf/pgf.h
index f93ed5768..b4f02aaf7 100644
--- a/src/runtime/c/pgf/pgf.h
+++ b/src/runtime/c/pgf/pgf.h
@@ -418,11 +418,28 @@ void pgf_drop_concrete(PgfDB *db, PgfRevision revision,
                        PgfText *name,
                        PgfExn *err);
 
+PGF_API_DECL
+void pgf_create_lincat(PgfDB *db,
+                       PgfRevision revision, PgfConcrRevision cnc_revision,
+                       PgfText *name, size_t n_fields, PgfExn *err);
+
+PGF_API_DECL
+void pgf_drop_lincat(PgfDB *db, PgfConcrRevision revision,
+                     PgfText *name, PgfExn *err);
+
 PGF_API_DECL
 void pgf_create_lin(PgfDB *db,
                     PgfRevision revision, PgfConcrRevision cnc_revision,
                     PgfText *name, size_t n_prods, PgfExn *err);
 
+PGF_API_DECL
+void pgf_drop_lin(PgfDB *db, PgfConcrRevision revision,
+                  PgfText *name, PgfExn *err);
+
+PGF_API_DECL
+int pgf_has_linearization(PgfDB *db, PgfConcrRevision revision,
+                          PgfText *name, PgfExn *err);
+
 PGF_API_DECL
 PgfLiteral pgf_get_global_flag(PgfDB *db, PgfRevision revision,
                                PgfText *name,
diff --git a/src/runtime/c/pgf/reader.cxx b/src/runtime/c/pgf/reader.cxx
index 62582b413..21ac4d020 100644
--- a/src/runtime/c/pgf/reader.cxx
+++ b/src/runtime/c/pgf/reader.cxx
@@ -544,6 +544,7 @@ ref<PgfConcrLincat> PgfReader::read_lincat()
 {
     ref<PgfConcrLincat> lincat = read_name(&PgfConcrLincat::name);
     lincat->ref_count = 1;
+    lincat->abscat = namespace_lookup(abstract->cats, &lincat->name);
     lincat->fields = read_vector(&PgfReader::read_text2);
     return lincat;
 }
diff --git a/src/runtime/haskell/PGF2.hsc b/src/runtime/haskell/PGF2.hsc
index afe05fc9e..dbd2a0fff 100644
--- a/src/runtime/haskell/PGF2.hsc
+++ b/src/runtime/haskell/PGF2.hsc
@@ -433,7 +433,12 @@ complete = error "TODO: complete"
 
 -- | Returns True if there is a linearization defined for that function in that language
 hasLinearization :: Concr -> Fun -> Bool
-hasLinearization = error "TODO: linearize"
+hasLinearization c name =
+  unsafePerformIO $
+  withText name $ \c_name ->
+  withForeignPtr (c_revision c) $ \c_revision -> do
+    c_res <- withPgfExn "hasLinearization" (pgf_has_linearization (c_db c) c_revision c_name)
+    return (c_res /= 0)
 
 -- | Linearizes an expression as a string in the language
 linearize :: Concr -> Expr -> String
diff --git a/src/runtime/haskell/PGF2/FFI.hsc b/src/runtime/haskell/PGF2/FFI.hsc
index 583f6b53e..9202a3d00 100644
--- a/src/runtime/haskell/PGF2/FFI.hsc
+++ b/src/runtime/haskell/PGF2/FFI.hsc
@@ -139,8 +139,16 @@ foreign import ccall pgf_clone_concrete :: Ptr PgfDB -> Ptr PGF -> Ptr PgfText -
 
 foreign import ccall pgf_drop_concrete :: Ptr PgfDB -> Ptr PGF -> Ptr PgfText -> Ptr PgfExn -> IO ()
 
+foreign import ccall pgf_create_lincat :: Ptr PgfDB -> Ptr PGF -> Ptr Concr -> Ptr PgfText -> CSize -> Ptr PgfExn -> IO ()
+
+foreign import ccall pgf_drop_lincat :: Ptr PgfDB -> Ptr Concr -> Ptr PgfText -> Ptr PgfExn -> IO ()
+
 foreign import ccall pgf_create_lin :: Ptr PgfDB -> Ptr PGF -> Ptr Concr -> Ptr PgfText -> CSize -> Ptr PgfExn -> IO ()
 
+foreign import ccall pgf_drop_lin :: Ptr PgfDB -> Ptr Concr -> Ptr PgfText -> Ptr PgfExn -> IO ()
+
+foreign import ccall pgf_has_linearization :: Ptr PgfDB -> Ptr Concr -> Ptr PgfText -> Ptr PgfExn -> IO CInt
+
 foreign import ccall pgf_get_global_flag :: Ptr PgfDB -> Ptr PGF -> Ptr PgfText -> Ptr PgfUnmarshaller -> Ptr PgfExn -> IO (StablePtr Literal)
 
 foreign import ccall pgf_set_global_flag :: Ptr PgfDB -> Ptr PGF -> Ptr PgfText -> StablePtr Literal -> Ptr PgfMarshaller -> Ptr PgfExn -> IO ()
diff --git a/src/runtime/haskell/PGF2/Transactions.hsc b/src/runtime/haskell/PGF2/Transactions.hsc
index 34af825d0..7adbea58b 100644
--- a/src/runtime/haskell/PGF2/Transactions.hsc
+++ b/src/runtime/haskell/PGF2/Transactions.hsc
@@ -20,7 +20,10 @@ module PGF2.Transactions
           , alterConcrete
           , dropConcrete
           , setConcreteFlag
+          , createLincat
+          , dropLincat
           , createLin
+          , dropLin
           ) where
 
 import PGF2.FFI
@@ -210,7 +213,22 @@ data PArg = PArg [(LIndex,LIndex)] {-# UNPACK #-} !LParam
 data Production = Production [PArg] LParam [[Symbol]]
                  deriving (Eq,Show)
 
+createLincat :: Cat -> [String] -> Transaction Concr ()
+createLincat name fields = Transaction $ \c_db c_abstr c_revision c_exn ->
+  withText name $ \c_name ->
+    pgf_create_lincat c_db c_abstr c_revision c_name (fromIntegral (length fields)) c_exn
+
+dropLincat :: Cat -> Transaction Concr ()
+dropLincat name = Transaction $ \c_db _ c_revision c_exn ->
+  withText name $ \c_name ->
+    pgf_drop_lincat c_db c_revision c_name c_exn
+
 createLin :: Fun -> [Production] -> Transaction Concr ()
 createLin name rules = Transaction $ \c_db c_abstr c_revision c_exn ->
   withText name $ \c_name ->
     pgf_create_lin c_db c_abstr c_revision c_name (fromIntegral (length rules)) c_exn
+
+dropLin :: Fun -> Transaction Concr ()
+dropLin name = Transaction $ \c_db _ c_revision c_exn ->
+  withText name $ \c_name ->
+    pgf_drop_lin c_db c_revision c_name c_exn