diff --git a/pgsql/graph/load_basic.sql b/pgsql/graph/load_basic.sql
index e0671b4..33eb646 100644
--- a/pgsql/graph/load_basic.sql
+++ b/pgsql/graph/load_basic.sql
@@ -1,24 +1,36 @@
 -- storage-common/qgsql/graph/load_basic.sql
 -- load bootstrap and basic semantic steps
 
--- basic concepts with fixed IDs
+-- bootstrap concepts with fixed IDs
 insert into steps (id, item, property, valtype, numval, textval) values 
     (1, 1, 2, 3, 1, null),          -- root: root assert root
     (2, 1, 2, 3, 2, null),          -- assert: root assert assert
     (3, 1, 2, 3, 3, null),          -- Class: root assert Class
     (4, 1, 2, 3, 4, null),          -- type: root assert type
     (5, 1, 2, 3, 5, null),          -- Property: root assert Property
-    (6, 1, 2, 3, 6, null);          -- ref: root assert ref
+    (6, 1, 2, 3, 6, null),          -- ref: root assert ref
+    (7, 1, 2, 3, 6, null),          -- Event: root assert Event
+    (8, 1, 2, 3, 6, null);          -- Domain: root assert Domain
 
 -- basic types and refs
 insert into steps (item, property, valtype, numval, textval) values 
+    (1, 4, 3, 8, null),             -- root type Domain
+    (2, 4, 3, 5, null),             -- assert type Property
     (3, 4, 3, 3, null),             -- Class type Class
-    (5, 4, 3, 3, null),             -- property type Class
     (4, 4, 3, 5, null),             -- type type Property
+    (5, 4, 3, 3, null),             -- property type Class
     (6, 4, 3, 5, null),             -- ref type Property
+    (7, 4, 3, 3, null),             -- Event type Class
+    (8, 4, 3, 3, null),             -- Domain type Class
     (1, 6, 1, null, 'root'),        -- root ref "root"
     (2, 6, 1, null, 'assert'),      -- assert ref "assert"
-    (4, 6, 1, null, 'type'),        -- type ref "type"
     (3, 6, 1, null, 'Class'),       -- Class ref "Class"
+    (4, 6, 1, null, 'type'),        -- type ref "type"
     (5, 6, 1, null, 'Property'),    -- Property ref "Property"
-    (6, 6, 1, null, 'ref');         -- ref ref "ref"
+    (6, 6, 1, null, 'ref'),         -- ref ref "ref"
+    (7, 6, 1, null, 'Event'),       -- Event ref "Event"
+    (8, 6, 1, null, 'Domain');      -- Domain ref "Domain"
+
+-- let IDs for steps added later start with 101
+select setval('steps_id_seq', 100)
+-- alter sequence steps_id_seq restart 101;
diff --git a/pgsql/graph/tables.sql b/pgsql/graph/tables.sql
index 6bcfe81..9eab067 100644
--- a/pgsql/graph/tables.sql
+++ b/pgsql/graph/tables.sql
@@ -1,8 +1,8 @@
 -- storage-common/qgsql/graph/tables.sql
 -- a simple generic RDF-like graph storage using only one tabel
 
-create sequence steps_id_seq start with 11;  
--- note: bootstrap rows get explicit IDs
+create sequence steps_id_seq start with 21;
+-- note: bootstrap rows (concepts) get explicit IDs
 
 create table steps (
     id bigint not null primary key default nextval('steps_id_seq'),