def testReflexive(self):
self.metamodel.define_class('A', [('Id', 'unique_id'),
('Next_Id', 'unique_id'),
('Name', 'string')])
endpint1 = xtuml.SingleAssociationLink('A', ids=['Id'], phrase='prev')
endpint2 = xtuml.SingleAssociationLink('A', ids=['Next_Id'], phrase='next')
self.metamodel.define_relation('R1', endpint1, endpint2)
first = self.metamodel.new('A', Name="First")
second = self.metamodel.new('A', Name="Second")
self.assertTrue(xtuml.relate(first, second, 1, 'prev'))
inst = xtuml.navigate_one(first).A[1, 'next']()
self.assertEqual(inst.Name, second.Name)
inst = xtuml.navigate_one(first).A[1, 'prev']()
self.assertIsNone(inst)
inst = xtuml.navigate_one(second).A[1, 'prev']()
self.assertEqual(inst.Name, first.Name)
inst = xtuml.navigate_one(second).A[1, 'next']()
self.assertIsNone(inst)
def test_reflexive(self):
self.metamodel.define_class('A', [('Id', 'unique_id'),
('Next_Id', 'unique_id'),
('Name', 'string')])
ass = self.metamodel.define_association(rel_id='R1',
source_kind='A',
source_keys=['Id'],
source_many=False,
source_conditional=False,
source_phrase='prev',
target_kind='A',
target_keys=['Next_Id'],
target_many=False,
target_conditional=False,
target_phrase='next')
ass.formalize()
first = self.metamodel.new('A', Name="First")
second = self.metamodel.new('A', Name="Second")
self.assertTrue(xtuml.relate(first, second, 1, 'prev'))
inst = xtuml.navigate_one(first).A[1, 'prev']()
self.assertEqual(inst.Name, second.Name)
inst = xtuml.navigate_one(first).A[1, 'next']()
self.assertIsNone(inst)
inst = xtuml.navigate_one(second).A[1, 'next']()
self.assertEqual(inst.Name, first.Name)
inst = xtuml.navigate_one(second).A[1, 'prev']()
self.assertIsNone(inst)
def test_relate(self):
s_edt = self.m.new('S_EDT')
s_dt = self.m.new('S_DT')
pe_pe = self.m.new('PE_PE')
self.assertFalse(xtuml.navigate_one(s_dt).S_EDT[17]())
self.assertTrue(xtuml.relate(s_dt, pe_pe, 8001))
self.assertTrue(xtuml.relate(s_dt, s_edt, 17))
self.assertEqual(s_edt, xtuml.navigate_one(s_dt).S_EDT[17]())
def test_relate(self):
s_edt = self.m.new('S_EDT')
s_dt = self.m.new('S_DT')
pe_pe = self.m.new('PE_PE')
self.assertFalse(xtuml.navigate_one(s_dt).S_EDT[17]())
self.assertTrue(xtuml.relate(s_dt, pe_pe, 8001))
self.assertTrue(xtuml.relate(s_dt, s_edt, 17))
self.assertEqual(s_edt, xtuml.navigate_one(s_dt).S_EDT[17]())
def test_delete(self):
inst = self.metamodel.select_any('S_DT', where(Name='void'))
self.assertTrue(xtuml.navigate_one(inst).PE_PE[8001]())
xtuml.delete(inst)
self.assertFalse(xtuml.navigate_one(inst).PE_PE[8001]())
inst = self.metamodel.select_any('S_DT', where(Name='void'))
self.assertFalse(inst)
def testRelateReflexive2(self):
inst1 = self.metamodel.new('ACT_SMT')
inst2 = self.metamodel.new('ACT_SMT')
act_blk = self.metamodel.new('ACT_BLK')
self.assertTrue(xtuml.relate(inst1, act_blk, 602))
self.assertTrue(xtuml.relate(inst2, act_blk, 602))
self.assertTrue(xtuml.relate(inst2, inst1, 661, 'succeeds'))
self.assertEqual(inst2, xtuml.navigate_one(inst1).ACT_SMT[661, 'succeeds']())
self.assertEqual(inst1, xtuml.navigate_one(inst2).ACT_SMT[661, 'precedes']())
def test_relate_reflexive_one_to_other(self):
inst1 = self.m.new('ACT_SMT')
inst2 = self.m.new('ACT_SMT')
act_blk = self.m.new('ACT_BLK')
self.assertTrue(xtuml.relate(inst1, act_blk, 602))
self.assertTrue(xtuml.relate(inst2, act_blk, 602))
self.assertTrue(xtuml.relate(inst1, inst2, 661, 'succeeds'))
self.assertEqual(inst2, xtuml.navigate_one(inst1).ACT_SMT[661, 'succeeds']())
self.assertEqual(inst1, xtuml.navigate_one(inst2).ACT_SMT[661, 'precedes']())
def test_relate_reflexive_other_to_one(self):
inst1 = self.m.new('ACT_SMT')
inst2 = self.m.new('ACT_SMT')
act_blk = self.m.new('ACT_BLK')
self.assertTrue(xtuml.relate(inst1, act_blk, 602))
self.assertTrue(xtuml.relate(inst2, act_blk, 602))
self.assertTrue(xtuml.relate(inst2, inst1, 661, 'precedes'))
self.assertEqual(inst2,
xtuml.navigate_one(inst1).ACT_SMT[661, 'succeeds']())
self.assertEqual(inst1,
xtuml.navigate_one(inst2).ACT_SMT[661, 'precedes']())
def test_serialize_schema(self):
schema = '''
CREATE TABLE X (BOOLEAN BOOLEAN,
INTEGER INTEGER,
REAL REAL,
STRING STRING,
UNIQUE_ID UNIQUE_ID,
Next UNIQUE_ID);
CREATE ROP REF_ID R1 FROM 1C X ( Next ) PHRASE 'precedes'
TO 1C X ( UNIQUE_ID ) PHRASE 'succeeds';
'''
loader = xtuml.ModelLoader()
loader.input(schema)
m = loader.build_metamodel()
x1 = m.new('X', Boolean=True, Integer=4, String='str')
x2 = m.new('X', Boolean=True, Integer=4, String='str')
xtuml.relate(x1, x2, 1, 'precedes')
s = xtuml.serialize_schema(m)
loader = xtuml.ModelLoader()
loader.input(s)
m = loader.build_metamodel()
self.assertFalse(m.select_any('X'))
x1 = m.new('X', Boolean=True, Integer=4, String='str')
x2 = m.new('X', Boolean=True, Integer=4, String='str')
xtuml.relate(x1, x2, 1, 'succeeds')
self.assertTrue(xtuml.navigate_one(x1).X[1, 'succeeds']())
def test_serialize_schema(self):
schema = '''
CREATE TABLE X (BOOLEAN BOOLEAN,
INTEGER INTEGER,
REAL REAL,
STRING STRING,
UNIQUE_ID UNIQUE_ID,
Next UNIQUE_ID);
CREATE ROP REF_ID R1 FROM 1C X ( Next ) PHRASE 'precedes'
TO 1C X ( UNIQUE_ID ) PHRASE 'succeeds';
'''
loader = xtuml.ModelLoader()
loader.input(schema)
m = loader.build_metamodel()
x1 = m.new('X', Boolean=True, Integer=4, String='str')
x2 = m.new('X', Boolean=True, Integer=4, String='str')
xtuml.relate(x1, x2, 1, 'precedes')
s = xtuml.serialize_schema(m)
loader = xtuml.ModelLoader()
loader.input(s)
m = loader.build_metamodel()
self.assertFalse(m.select_any('X'))
x1 = m.new('X', Boolean=True, Integer=4, String='str')
x2 = m.new('X', Boolean=True, Integer=4, String='str')
xtuml.relate(x1, x2, 1, 'succeeds')
self.assertTrue(xtuml.navigate_one(x1).X[1, 'succeeds']())
def test_unrelate(self):
self.metamodel.define_class('A', [('Id', 'unique_id'),
('B_Id', 'unique_id')])
self.metamodel.define_class('B', [('Id', 'unique_id')])
self.metamodel.define_association(rel_id='R1',
source_kind='A',
target_kind='B',
source_keys=['B_Id'],
target_keys=['Id'],
source_many=False,
target_many=False,
source_conditional=True,
target_conditional=True,
source_phrase='',
target_phrase='')
a = self.metamodel.new('A')
b = self.metamodel.new('B')
xtuml.relate(a, b, 1)
text = '''
.select any a from instances of A
.select any b from instances of B
.print "${a}"
.print "${b}"
.unrelate a from b across R1
'''
self.eval_text(text)
a = self.metamodel.select_any('A')
b = xtuml.navigate_one(a).B[1]()
self.assertFalse(b)
def test_relate(self):
self.metamodel.define_class('A', [('Id', 'unique_id'),
('B_Id', 'unique_id')])
self.metamodel.define_class('B', [('Id', 'unique_id')])
self.metamodel.define_association(rel_id='R1',
source_kind='A',
target_kind='B',
source_keys=['B_Id'],
target_keys=['Id'],
source_many=False,
target_many=False,
source_conditional=True,
target_conditional=True,
source_phrase='',
target_phrase='')
text = '''
.create object instance a of A
.create object instance b of B
.relate a to b across R1
'''
self.eval_text(text)
a = self.metamodel.select_any('A')
b = xtuml.navigate_one(a).B[1]()
self.assertTrue(b)
def test_relate_reflexive(self):
self.metamodel.define_class('A', [('Id', 'unique_id'),
('Next_Id', 'unique_id'),
('Name', 'string')])
self.metamodel.define_association(rel_id='R1',
source_kind='A',
target_kind='A',
source_keys=['Id'],
target_keys=['Next_Id'],
source_many=False,
target_many=False,
source_conditional=True,
target_conditional=True,
source_phrase='prev',
target_phrase='next')
text = '''
.create object instance a1 of A
.create object instance a2 of A
.assign a1.Name = "First"
.assign a2.Name = "Second"
.relate a2 to a1 across R1.'next'
'''
self.eval_text(text)
a1 = self.metamodel.select_any('A', lambda sel: sel.Name == "First")
a2 = xtuml.navigate_one(a1).A[1, 'prev']()
self.assertTrue(a2)
self.assertEqual(a2.Name, 'Second')
def test_unrelate_reflexive(self):
self.metamodel.define_class('A', [('Id', 'unique_id'),
('Next_Id', 'unique_id'),
('Name', 'string')])
self.metamodel.define_association(rel_id='R1',
source_kind='A',
target_kind='A',
source_keys=['Id'],
target_keys=['Next_Id'],
source_many=False,
target_many=False,
source_conditional=True,
target_conditional=True,
source_phrase='prev',
target_phrase='next')
first = self.metamodel.new('A', Name="First")
second = self.metamodel.new('A', Name="Second")
xtuml.relate(first, second, 1, 'prev')
text = '''
.select any first_inst from instances of A where (selected.Name == "First")
.select one second_inst related by first_inst->A[R1.'next']
.unrelate first_inst from second_inst across R1.'prev'
'''
self.eval_text(text)
a1 = self.metamodel.select_any('A', lambda sel: sel.Name == "First")
a2 = xtuml.navigate_one(a1).A[1, 'next']()
self.assertFalse(a2)
def testRelateInvertedOrder(self):
s_edt = self.metamodel.new('S_EDT')
s_dt = self.metamodel.new('S_DT')
pe_pe = self.metamodel.new('PE_PE')
self.assertTrue(xtuml.relate(pe_pe, s_dt, 8001))
self.assertTrue(xtuml.relate(s_edt, s_dt, 17))
self.assertEqual(s_edt, xtuml.navigate_one(s_dt).S_EDT[17]())
def test_clone(self):
s_ee = self.metamodel.new('S_EE',
Name='Test',
Descrip='test',
Key_Lett='TEST')
pe_pe = self.metamodel.new('PE_PE')
self.assertTrue(xtuml.relate(s_ee, pe_pe, 8001))
m = ooaofooa.empty_model()
self.assertNotEqual(pe_pe, m.clone(pe_pe))
self.assertNotEqual(s_ee, m.clone(s_ee))
s_ee_clone = m.select_any('S_EE', where(Name='Test'))
self.assertNotEqual(s_ee, s_ee_clone)
self.assertEqual(s_ee_clone.EE_ID, s_ee.EE_ID)
self.assertEqual(s_ee_clone.Name, s_ee.Name)
self.assertEqual(s_ee_clone.Descrip, s_ee.Descrip)
self.assertEqual(s_ee_clone.Key_Lett, s_ee.Key_Lett)
pe_pe_clone = xtuml.navigate_one(s_ee_clone).PE_PE[8001]()
self.assertTrue(pe_pe_clone)
self.assertNotEqual(pe_pe, pe_pe_clone)
self.assertEqual(pe_pe_clone.Element_ID, pe_pe.Element_ID)
self.assertEqual(pe_pe_clone.Visibility, pe_pe.Visibility)
self.assertEqual(pe_pe_clone.Package_ID, pe_pe.Package_ID)
self.assertEqual(pe_pe_clone.Component_ID, pe_pe.Component_ID)
self.assertEqual(pe_pe_clone.type, pe_pe.type)
def test_unrelate(self):
self.metamodel.define_class('A', [('Id', 'unique_id'), ('B_Id', 'unique_id')])
self.metamodel.define_class('B', [('Id', 'unique_id')])
self.metamodel.define_association(rel_id='R1',
source_kind='A',
target_kind='B',
source_keys=['B_Id'],
target_keys=['Id'],
source_many=False,
target_many=False,
source_conditional=True,
target_conditional=True,
source_phrase='',
target_phrase='')
a = self.metamodel.new('A')
b = self.metamodel.new('B')
xtuml.relate(a, b, 1)
text = '''
.select any a from instances of A
.select any b from instances of B
.print "${a}"
.print "${b}"
.unrelate a from b across R1
'''
self.eval_text(text)
a = self.metamodel.select_any('A')
b = xtuml.navigate_one(a).B[1]()
self.assertFalse(b)
def test_unrelate_reflexive(self):
self.metamodel.define_class('A', [('Id', 'unique_id'),
('Next_Id', 'unique_id'),
('Name', 'string')])
self.metamodel.define_association(rel_id='R1',
source_kind='A',
target_kind='A',
source_keys=['Id'],
target_keys=['Next_Id'],
source_many=False,
target_many=False,
source_conditional=True,
target_conditional=True,
source_phrase='prev',
target_phrase='next')
first = self.metamodel.new('A', Name="First")
second = self.metamodel.new('A', Name="Second")
xtuml.relate(first, second, 1, 'prev')
text = '''
.select any first_inst from instances of A where (selected.Name == "First")
.select one second_inst related by first_inst->A[R1.'next']
.unrelate first_inst from second_inst across R1.'prev'
'''
self.eval_text(text)
a1 = self.metamodel.select_any('A', lambda sel: sel.Name == "First")
a2 = xtuml.navigate_one(a1).A[1, 'next']()
self.assertFalse(a2)
def test_relate_reflexive(self):
self.metamodel.define_class('A', [('Id', 'unique_id'),
('Next_Id', 'unique_id'),
('Name', 'string')])
self.metamodel.define_association(rel_id='R1',
source_kind='A',
target_kind='A',
source_keys=['Id'],
target_keys=['Next_Id'],
source_many=False,
target_many=False,
source_conditional=True,
target_conditional=True,
source_phrase='prev',
target_phrase='next')
text = '''
.create object instance a1 of A
.create object instance a2 of A
.assign a1.Name = "First"
.assign a2.Name = "Second"
.relate a2 to a1 across R1.'next'
'''
self.eval_text(text)
a1 = self.metamodel.select_any('A', lambda sel: sel.Name == "First")
a2 = xtuml.navigate_one(a1).A[1, 'prev']()
self.assertTrue(a2)
self.assertEqual(a2.Name, 'Second')
def accept_SelectRelatedNode(self, node):
handle = self.accept(node.handle).fget()
if node.cardinality == 'many':
chain = xtuml.navigate_many(handle)
else:
chain = xtuml.navigate_one(handle)
for step in self.accept(node.navigation_chain):
chain = step(chain)
self.symtab.install_symbol(node.variable_name, chain())
def accept_SelectRelatedNode(self, node):
handle = self.accept(node.handle).fget()
if node.cardinality == 'many':
chain = xtuml.navigate_many(handle)
else:
chain = xtuml.navigate_one(handle)
for step in self.accept(node.navigation_chain):
chain = step(chain)
self.symtab.install_symbol(node.variable_name, chain())
def testOneToMany(self):
self.metamodel.define_class('A', [('Id', 'unique_id')])
self.metamodel.define_class('B', [('Id', 'unique_id'), ('A_Id', 'unique_id')])
a_endpint = xtuml.SingleAssociationLink('A', ids=['Id'])
b_endpint = xtuml.ManyAssociationLink('B', ids=['A_Id'])
self.metamodel.define_relation(1, a_endpint, b_endpint)
a = self.metamodel.new('A')
b = self.metamodel.new('B')
self.assertTrue(xtuml.relate(a, b, 1))
self.assertEqual(a, xtuml.navigate_one(b).A[1]())
def test_rop_without_identifier_sequence(self, m):
'''
CREATE TABLE X ();
CREATE TABLE Y ();
CREATE ROP REF_ID R1 FROM MC X ()
TO MC Y ();
INSERT INTO X VALUES ();
INSERT INTO Y VALUES ();
'''
x = m.select_any('X')
self.assertTrue(x is not None)
y = xtuml.navigate_one(x).Y[1]()
self.assertTrue(y is not None)
def test_rop_without_identifier_sequence(self, m):
'''
CREATE TABLE X ();
CREATE TABLE Y ();
CREATE ROP REF_ID R1 FROM MC X ()
TO MC Y ();
INSERT INTO X VALUES ();
INSERT INTO Y VALUES ();
'''
x = m.select_any('X')
self.assertTrue(x is not None)
y = xtuml.navigate_one(x).Y[1]()
self.assertTrue(y is not None)
def test_rop_named_as_cardinality(self, m):
'''
CREATE TABLE M (Id INTEGER, MC_Id INTEGER);
CREATE TABLE MC (Id INTEGER);
CREATE ROP REF_ID R1 FROM M M ( MC_Id )
TO 1 MC ( Id );
INSERT INTO MC VALUES (2);
INSERT INTO M VALUES (1, 2);
'''
val = m.select_any('M')
self.assertTrue(val is not None)
self.assertEqual(val.Id, 1)
val = xtuml.navigate_one(val).MC[1]()
self.assertTrue(val is not None)
self.assertEqual(val.Id, 2)
def accept_SelectRelatedWhereNode(self, node):
def where(selected):
self.symtab.enter_block()
self.symtab.install_symbol('selected', selected)
value = self.accept(node.where_clause)
self.symtab.leave_block()
return value.fget()
handle = self.accept(node.handle).fget()
if node.cardinality == 'many':
chain = xtuml.navigate_many(handle)
else:
chain = xtuml.navigate_one(handle)
for step in self.accept(node.navigation_chain):
chain = step(chain)
self.symtab.install_symbol(node.variable_name, chain(where))
def test_rop_named_as_cardinality(self, m):
'''
CREATE TABLE M (Id INTEGER, MC_Id INTEGER);
CREATE TABLE MC (Id INTEGER);
CREATE ROP REF_ID R1 FROM M M ( MC_Id )
TO 1 MC ( Id );
INSERT INTO MC VALUES (2);
INSERT INTO M VALUES (1, 2);
'''
val = m.select_any('M')
self.assertTrue(val is not None)
self.assertEqual(val.Id, 1)
val = xtuml.navigate_one(val).MC[1]()
self.assertTrue(val is not None)
self.assertEqual(val.Id, 2)
def accept_SelectRelatedWhereNode(self, node):
def where(selected):
self.symtab.enter_block()
self.symtab.install_symbol('selected', selected)
value = self.accept(node.where_clause)
self.symtab.leave_block()
return value.fget()
handle = self.accept(node.handle).fget()
if node.cardinality == 'many':
chain = xtuml.navigate_many(handle)
else:
chain = xtuml.navigate_one(handle)
for step in self.accept(node.navigation_chain):
chain = step(chain)
self.symtab.install_symbol(node.variable_name, chain(where))
def test_case_sensitivity(self):
self.metamodel.define_class('Aa', [('Id', 'unique_id')])
self.metamodel.new('AA')
self.assertTrue(self.metamodel.select_any('aA'))
self.assertTrue(self.metamodel.select_any('AA'))
self.assertTrue(self.metamodel.select_any('Aa'))
self.assertTrue(self.metamodel.select_any('aa'))
self.metamodel.new('Aa')
self.metamodel.new('aA')
self.metamodel.new('aa')
self.assertEqual(len(self.metamodel.select_many('aA')), 4)
self.assertEqual(len(self.metamodel.select_many('AA')), 4)
self.assertEqual(len(self.metamodel.select_many('Aa')), 4)
self.assertEqual(len(self.metamodel.select_many('aa')), 4)
metaclass = self.metamodel.find_metaclass('aa')
metaclass.append_attribute('Next_Id', 'unique_id')
ass = self.metamodel.define_association(rel_id='R1',
source_kind='AA',
source_keys=['ID'],
source_many=False,
source_conditional=False,
source_phrase='prev',
target_kind='aa',
target_keys=['next_id'],
target_many=False,
target_conditional=False,
target_phrase='next')
next_id = None
for inst in self.metamodel.select_many('aa'):
inst.next_ID = next_id
next_id = inst.Id
ass.batch_relate()
ass.formalize()
self.assertTrue(xtuml.navigate_one(inst).aa[1, 'next'].AA[1, 'next']())
def test_one_to_many(self):
self.metamodel.define_class('A', [('Id', 'unique_id')])
self.metamodel.define_class('B', [('Id', 'unique_id'), ('A_Id', 'unique_id')])
ass = self.metamodel.define_association(rel_id=1,
source_kind='A',
source_keys=['Id'],
source_many=False,
source_conditional=False,
source_phrase='',
target_kind='B',
target_keys=['A_Id'],
target_many=True,
target_conditional=False,
target_phrase='')
ass.formalize()
a = self.metamodel.new('A')
b = self.metamodel.new('B')
self.assertTrue(xtuml.relate(a, b, 1))
self.assertEqual(a, xtuml.navigate_one(b).A[1]())
def test_relate(self):
self.metamodel.define_class('A', [('Id', 'unique_id'), ('B_Id', 'unique_id')])
self.metamodel.define_class('B', [('Id', 'unique_id')])
self.metamodel.define_association(rel_id='R1',
source_kind='A',
target_kind='B',
source_keys=['B_Id'],
target_keys=['Id'],
source_many=False,
target_many=False,
source_conditional=True,
target_conditional=True,
source_phrase='',
target_phrase='')
text = '''
.create object instance a of A
.create object instance b of B
.relate a to b across R1
'''
self.eval_text(text)
a = self.metamodel.select_any('A')
b = xtuml.navigate_one(a).B[1]()
self.assertTrue(b)
def test_clone(self):
s_ee = self.metamodel.new('S_EE', Name='Test', Descrip='test', Key_Lett='TEST')
pe_pe = self.metamodel.new('PE_PE')
self.assertTrue(xtuml.relate(s_ee, pe_pe, 8001))
m = ooaofooa.empty_model()
self.assertNotEqual(pe_pe, m.clone(pe_pe))
self.assertNotEqual(s_ee, m.clone(s_ee))
s_ee_clone = m.select_any('S_EE', where(Name='Test'))
self.assertNotEqual(s_ee, s_ee_clone)
self.assertEqual(s_ee_clone.EE_ID, s_ee.EE_ID)
self.assertEqual(s_ee_clone.Name, s_ee.Name)
self.assertEqual(s_ee_clone.Descrip, s_ee.Descrip)
self.assertEqual(s_ee_clone.Key_Lett, s_ee.Key_Lett)
pe_pe_clone = xtuml.navigate_one(s_ee_clone).PE_PE[8001]()
self.assertTrue(pe_pe_clone)
self.assertNotEqual(pe_pe, pe_pe_clone)
self.assertEqual(pe_pe_clone.Element_ID, pe_pe.Element_ID)
self.assertEqual(pe_pe_clone.Visibility, pe_pe.Visibility)
self.assertEqual(pe_pe_clone.Package_ID, pe_pe.Package_ID)
self.assertEqual(pe_pe_clone.Component_ID, pe_pe.Component_ID)
self.assertEqual(pe_pe_clone.type, pe_pe.type)
def testNavigateInvalidHandle(self):
self.assertIsNone(xtuml.navigate_one('test')())
def testNavigateNone(self):
self.assertIsNone(xtuml.navigate_one(None)())
self.assertEqual(len(xtuml.navigate_many(None)()), 0)
def testRelateInvalidRelId(self):
s_edt = self.metamodel.new('S_EDT')
s_dt = self.metamodel.new('S_DT')
xtuml.relate(s_edt, s_dt, 0)
self.assertEqual(s_edt, xtuml.navigate_one(s_dt).S_EDT[17]())
def testNavOne(self):
m = self.metamodel
s_dt = m.select_any('S_DT', where(Name='void'))
pe_pe = xtuml.navigate_one(s_dt).PE_PE[8001](lambda inst: True)
self.assertEqual(s_dt.DT_ID, pe_pe.Element_ID)
