diff --git a/pgsql/graph/load_basic.sql b/pgsql/graph/load_basic.sql
index d9aec35..d411858 100644
--- a/pgsql/graph/load_basic.sql
+++ b/pgsql/graph/load_basic.sql
@@ -2,7 +2,7 @@
 -- load bootstrap and basic semantic steps
 
 -- basic concepts with fixed IDs
-insert into steps (id, item, property, valtype, numval, strval) values 
+insert into steps (id, item, property, valtype, numval, textval) values 
     (1, 1, 2, 3, 1, null),          -- this: this is this
     (2, 1, 2, 3, 2, null),          -- is: this is is
     (3, 1, 2, 3, 3, null),          -- Class: this is Class
@@ -11,7 +11,7 @@ insert into steps (id, item, property, valtype, numval, strval) values
     (6, 1, 2, 3, 6, null);          -- name: this is name
 
 -- basic types and names
-insert into steps (item, property, valtype, numval, strval) values 
+insert into steps (item, property, valtype, numval, textval) values 
     (3, 4, 3, 3, null),             -- Class type Class
     (5, 4, 3, 3, null),             -- property type Class
     (4, 4, 3, 5, null),             -- type type Property
diff --git a/pgsql/graph/tables.sql b/pgsql/graph/tables.sql
index 0b536d7..6bcfe81 100644
--- a/pgsql/graph/tables.sql
+++ b/pgsql/graph/tables.sql
@@ -6,18 +6,18 @@ create sequence steps_id_seq start with 11;
 
 create table steps (
     id bigint not null primary key default nextval('steps_id_seq'),
-    item bigint not null,
-    property bigint not null references steps,
+    item bigint not null,       --references steps,
+    property bigint not null,   --references steps,
     valtype smallint not null check (valtype in (0, 1, 2, 3)),
     -- 0 = Nothing, 1 = Text, 2 = Number, 3 = Step
     numval bigint, -- null except for valtype 2 and 3
-    strval text    -- null except for valtype 1
+    textval text   -- null except for valtype 1
 );
 
 -- indexes
 
-create index idx_ipv on steps USING btree (item, property, valtype, numval, strval);
-create index idx_pv on steps using btree (property, valtype, numval, strval);
+create index idx_ipv on steps USING btree (item, property, valtype, numval, textval);
+create index idx_pv on steps using btree (property, valtype, numval, textval);
 
 -- optional, not used (values make only sense together with a property):
 --create index idx_vi on steps using btree (valtype, numval, strval, item);