--- /dev/null
+UNIFICATION_NT = '''<topology xmlns="urn:opendaylight:topology:correlation" xmlns:n="urn:TBD:params:xml:ns:yang:network-topology">
+ <n:topology-id>topo:1</n:topology-id>
+ <correlations>
+ <output-model>{output-model}</output-model>
+ <correlation>
+ <correlation-id>1</correlation-id>
+ <type>{type}</type>
+ <correlation-item>{correlation-item}</correlation-item>
+ <aggregation>
+ <aggregation-type>{aggregation-type}</aggregation-type>
+ <mapping>
+ <input-model>{input-model}</input-model>
+ <underlay-topology>{underlay-topology-id}</underlay-topology>
+ <target-field>{target-field}</target-field>
+ <aggregate-inside>false</aggregate-inside>
+ </mapping>
+ <mapping>
+ <input-model>{input-model}</input-model>
+ <underlay-topology>{underlay-topology-id}</underlay-topology>
+ <target-field>{target-field}</target-field>
+ <aggregate-inside>false</aggregate-inside>
+ </mapping>
+ </aggregation>
+ </correlation>
+ </correlations>
+ </topology>'''
+
+UNIFICATION_NT_AGREGATE_INSIDE = '''<topology xmlns="urn:opendaylight:topology:correlation" xmlns:n="urn:TBD:params:xml:ns:yang:network-topology">
+ <n:topology-id>topo:1</n:topology-id>
+ <correlations>
+ <output-model>{output-model}</output-model>
+ <correlation>
+ <correlation-id>1</correlation-id>
+ <type>{type}</type>
+ <correlation-item>{correlation-item}</correlation-item>
+ <aggregation>
+ <aggregation-type>{aggregation-type}</aggregation-type>
+ <mapping>
+ <input-model>{input-model}</input-model>
+ <underlay-topology>{underlay-topology-id}</underlay-topology>
+ <target-field>{target-field}</target-field>
+ <aggregate-inside>true</aggregate-inside>
+ </mapping>
+ </aggregation>
+ </correlation>
+ </correlations>
+ </topology>'''
+
+FILTRATION_NT = '''<topology xmlns="urn:opendaylight:topology:correlation" xmlns:n="urn:TBD:params:xml:ns:yang:network-topology">
+ <n:topology-id>topo:1</n:topology-id>
+ <correlations>
+ <output-model>{output-model}</output-model>
+ <correlation>
+ <correlation-id>1</correlation-id>
+ <type>filtration-only</type>
+ <correlation-item>{correlation-item}</correlation-item>
+ <filtration>
+ <underlay-topology>{underlay-topology-id}</underlay-topology>
+ <!-- Filter -->
+ </filtration>
+ </correlation>
+ </correlations>
+ </topology>'''
+
+FILTER_IPV4 = '''<filter>
+ <input-model>{input-model}</input-model>
+ <filter-id>1</filter-id>
+ <target-field>{target-field}</target-field>
+ <filter-type>ipv4-address</filter-type>
+ <ipv4-address-filter>
+ <ipv4-address>{ipv4}</ipv4-address>
+ </ipv4-address-filter>
+ </filter>'''