RESTconf:

If you remove all Netconf nodes with a HTTP DELETE to the following URL:

http://localhost:8181/restconf/config/network-topology:network-topology/topology/topology-netconf/

The topology tree will look something like this:

{
"network-topology": {
"topology": [

{ "topology-id": "ovsdb:1" }

]
}
}

But the operational tree still has all the data

{
"network-topology": {
"topology": [
{
"topology-id": "topology-netconf",
"node": [
{
"node-id": "sfc-netconf",
"netconf-node-topology:connection-status": "connected",
"netconf-node-topology:available-capabilities":

{ "available-capability": [ "urn:ietf:params:netconf:base:1.1", "(urn:ietf:params:xml:ns:yang:ietf-yang-types?revision=2010-09-24)ietf-yang-types", "(urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring-extension?revision=2013-12-10)ietf-netconf-monitoring-extension", "urn:ietf:params:netconf:base:1.0", "urn:ietf:params:netconf:capability:exi:1.0", "(urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring?revision=2010-10-04)ietf-netconf-monitoring", "(urn:ietf:params:xml:ns:yang:ietf-inet-types?revision=2010-09-24)ietf-inet-types" ] }

,
"netconf-node-topology:port": 17830,
"netconf-node-topology:unavailable-capabilities": {},
"netconf-node-topology:host": "127.0.0.1"
},
{
"node-id": "controller-config",
"netconf-node-topology:connection-status": "connected",
"netconf-node-topology:available-capabilities":

{ "available-capability": [ "urn:ietf:params:netconf:base:1.1", "(urn:opendaylight:params:xml:ns:yang:controller:config:sfc-netconf:impl?revision=2014-10-20)sfc-netconf-impl", "(urn:cisco:params:xml:ns:yang:sfc-sl?revision=2014-07-01)service-locator", "(urn:opendaylight:params:xml:ns:yang:controller:config:sfc-provider:impl?revision=2014-06-30)sfc-provider-impl", "(urn:opendaylight:queue:statistics?revision=2013-12-16)opendaylight-queue-statistics", "(urn:ietf:params:xml:ns:netconf:notification:1.0?revision=2008-07-14)notifications", "(urn:opendaylight:l2switch:main-impl?revision=2014-05-28)main-impl", "(urn:opendaylight:params:xml:ns:yang:controller:config:sfc-l2renderer:impl?revision=2014-09-01)sfc-l2renderer-impl", "(urn:opendaylight:params:xml:ns:yang:controller:netconf:mdsal:mapper?revision=2015-01-14)netconf-mdsal-mapper", "(urn:TBD:params:xml:ns:yang:nt:l3-unicast-igp-topology?revision=2013-10-21)l3-unicast-igp-topology", "(urn:opendaylight:params:xml:ns:yang:controller:netty?revision=2013-11-19)netty", "(urn:ietf:params:xml:ns:yang:packet-fields?revision=2014-06-25)packet-fields", "(urn:opendaylight:address-tracker?revision=2014-06-17)address-tracker", "(urn:ietf:params:xml:ns:yang:ietf-netconf-notifications?revision=2012-02-06)ietf-netconf-notifications", "(urn:ietf:params:xml:ns:yang:ospf-topology?revision=2013-07-12)ospf-topology", "urn:ietf:params:netconf:base:1.0", "(urn:opendaylight:openflowjava:nx:action?revision=2014-04-21)nicira-action", "(urn:ietf:params:xml:ns:yang:ietf-netconf-monitoring-extension?revision=2013-12-10)ietf-netconf-monitoring-extension", "(urn:ietf:params:xml:ns:yang:ietf-restconf?revision=2013-10-19)ietf-restconf", "(urn:opendaylight:meter:statistics?revision=2013-11-11)opendaylight-meter-statistics", "(urn:opendaylight:host-tracker?revision=2014-06-24)host-tracker-service", "(http://netconfcentral.org/ns/XSQL?revision=2014-06-26)XSQL", 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"(urn:opendaylight:params:xml:ns:yang:controller:md:sal:dom:pingpong?revision=2014-11-07)opendaylight-pingpong-broker", "(urn:opendaylight:params:xml:ns:yang:controller:config:netconf:northbound:impl?revision=2015-01-12)netconf-northbound-impl", "(urn:cisco:params:xml:ns:yang:sfc-scf?revision=2014-07-01)service-function-classifier", "(urn:opendaylight:params:xml:ns:yang:openflowplugin:nx:config:impl?revision=2014-07-11)nicira-extension-impl", "(urn:opendaylight:params:xml:ns:yang:aaa:credential-store?revision=2015-02-26)credential-store", "(urn:opendaylight:echo:service?revision=2015-03-05)sal-echo", "(urn:opendaylight:params:xml:ns:yang:southbound:impl?revision=2014-12-10)southbound-impl", "(urn:opendaylight:group:service?revision=2013-09-18)sal-group", "(urn:opendaylight:flow:errors?revision=2013-11-16)flow-errors", "(urn:opendaylight:params:xml:ns:yang:openflow:applications:lldp-speaker?revision=2014-10-23)lldp-speaker", "(urn:TBD:params:xml:ns:yang:ospf-topology?revision=2013-10-21)ospf-topology", "(urn:opendaylight:params:xml:ns:yang:controller:md:sal:core:spi:config-dom-store?revision=2014-06-17)opendaylight-config-dom-datastore", "(urn:opendaylight:params:xml:ns:yang:openflow:applications:of-switch-config-pusher?revision=2014-10-15)of-switch-config-pusher", "(urn:opendaylight:packet:basepacket?revision=2014-05-28)base-packet", "(urn:opendaylight:packet:service?revision=2013-07-09)packet-processing", "(urn:opendaylight:flow:types:port?revision=2013-09-25)opendaylight-port-types", "(urn:opendaylight:flow:topology:discovery?revision=2013-08-19)flow-topology-discovery", "(urn:opendaylight:flow:table:statistics?revision=2013-12-15)opendaylight-flow-table-statistics", "(urn:cisco:params:xml:ns:yang:sfc-sff?revision=2014-07-01)service-function-forwarder", "(urn:opendaylight:params:xml:ns:yang:controller:md:sal:common?revision=2013-10-28)opendaylight-md-sal-common", 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"(urn:opendaylight:params:xml:ns:yang:overlay?revision=2015-01-05)overlay", "(urn:opendaylight:params:xml:ns:yang:controller:md:sal:rest:connector?revision=2014-07-24)opendaylight-rest-connector", "(urn:opendaylight:params:xml:ns:yang:ovsdb?revision=2015-01-05)ovsdb", "(urn:opendaylight:params:xml:ns:yang:controller:md:sal:dom?revision=2013-10-28)opendaylight-md-sal-dom", "(urn:opendaylight:params:xml:ns:yang:controller:netconf:mdsal:monitoring?revision=2015-02-18)netconf-mdsal-monitoring", "(urn:opendaylight:params:xml:ns:yang:openflowplugin:app:statistics-manager?revision=2014-09-25)statistics-manager", "(urn:opendaylight:table:types?revision=2013-10-26)opendaylight-table-types", "(urn:opendaylight:params:xml:ns:yang:controller:netconf:northbound:ssh?revision=2015-01-14)netconf-northbound-ssh", "(urn:opendaylight:packet:arp?revision=2014-05-28)arp-packet", "(urn:opendaylight:yang:extension:yang-ext?revision=2013-07-09)yang-ext", "(urn:opendaylight:openflow:system?revision=2013-09-27)system-notifications", "(urn:opendaylight:openflow:common:types?revision=2013-07-31)openflow-types", "(urn:TBD:params:xml:ns:yang:network:ted?revision=2013-10-21)ted", "(urn:opendaylight:openflow:common:action?revision=2015-02-03)openflow-action", "(urn:opendaylight:params:xml:ns:yang:openflowplugin:ofjava:nx:config?revision=2014-07-11)openflowjava-nx-config", "(urn:opendaylight:l2switch:host-tracker-impl?revision=2014-05-28)host-tracker-impl", "(urn:opendaylight:openflow:oxm?revision=2015-02-25)openflow-extensible-match", "(urn:opendaylight:packet:loop-remover-impl?revision=2014-05-28)loop-remover-impl", "(urn:ietf:params:xml:ns:yang:ietf-yang-types?revision=2010-09-24)ietf-yang-types", "(urn:opendaylight:params:xml:ns:yang:controller:md:sal:remote?revision=2014-01-14)sal-remote", "(urn:opendaylight:params:xml:ns:yang:controller:config:netconf:northbound?revision=2015-01-14)netconf-northbound", "(urn:TBD:params:xml:ns:yang:network-topology?revision=2013-07-12)network-topology", "urn:ietf:params:netconf:capability:candidate:1.0", "(urn:opendaylight:group:types?revision=2013-10-18)opendaylight-group-types", "(urn:opendaylight:params:xml:ns:yang:controller:threadpool:impl:fixed?revision=2013-12-01)threadpool-impl-fixed", "(urn:opendaylight:params:xml:ns:yang:controller:config:sfc-ovs:impl?revision=2014-10-20)sfc-ovs-impl", "(urn:opendaylight:params:xml:ns:yang:openflowplugin:ofjava:nx:api:config?revision=2014-07-11)openflowjava-nx-api-config", "(urn:opendaylight:params:xml:ns:yang:controller:threadpool?revision=2013-04-09)threadpool", "(urn:opendaylight:params:xml:ns:yang:controller:netty:threadgroup?revision=2013-11-07)threadgroup", "(urn:opendaylight:flow:service?revision=2013-08-19)sal-flow", "(urn:opendaylight:params:xml:ns:yang:controller:md:sal:binding?revision=2013-10-28)opendaylight-md-sal-binding", 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"(urn:cisco:params:xml:ns:yang:sfc-ss?revision=2014-07-01)service-statistics", "(urn:ietf:params:xml:ns:netmod:notification?revision=2008-07-14)nc-notifications", "(urn:opendaylight:flow:statistics?revision=2013-08-19)opendaylight-flow-statistics", "(urn:opendaylight:model:topology:inventory?revision=2013-10-30)opendaylight-topology-inventory", "(urn:cisco:params:xml:ns:yang:sfc-sn?revision=2014-07-01)service-node", "(urn:cisco:params:xml:ns:yang:sfc-acl?revision=2014-07-01)service-function-acl", "(urn:cisco:params:xml:ns:yang:sfc-sff-ovs?revision=2014-07-01)service-function-forwarder-ovs", "(urn:opendaylight:flow:inventory?revision=2013-08-19)flow-node-inventory", "(urn:opendaylight:params:xml:ns:yang:controller:netty:eventexecutor?revision=2013-11-12)netty-event-executor", "(urn:opendaylight:params:xml:ns:yang:controller:md:sal:connector:netconf?revision=2013-10-28)odl-sal-netconf-connector-cfg", "(urn:opendaylight:openflow:augments?revision=2015-02-25)openflow-augments", 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"(urn:opendaylight:flow:types:queue?revision=2013-09-25)opendaylight-queue-types", "(urn:opendaylight:packet:arp-handler-impl?revision=2014-05-28)arp-handler-impl", "(urn:ietf:params:xml:ns:yang:ietf-inet-types?revision=2010-09-24)ietf-inet-types", "(urn:opendaylight:openflow:protocol?revision=2013-07-31)openflow-protocol", "(urn:TBD:params:xml:ns:yang:network:ted?revision=2013-07-12)ted", "(urn:opendaylight:params:xml:ns:yang:controller:config:sfc-sb-rest-provider:impl?revision=2014-10-20)sfc-sb-rest-provider-impl", "(urn:cisco:params:xml:ns:yang:sfc-sfg?revision=2016-02-02)service-function-group", "(urn:opendaylight:params:xml:ns:yang:controller:threadpool:impl:scheduled?revision=2013-12-01)threadpool-impl-scheduled", "(urn:opendaylight:meter:types?revision=2013-09-18)opendaylight-meter-types", "(urn:opendaylight:table:service?revision=2013-10-26)sal-table", "(urn:opendaylight:openflow:common:instruction?revision=2013-07-31)openflow-instruction" ] }

,
"netconf-node-topology:port": 1830,
"netconf-node-topology:unavailable-capabilities": {},
"netconf-node-topology:host": "127.0.0.1"
}
]
},

{ "topology-id": "ovsdb:1" }

,

{ "topology-id": "flow:1" }

]
}
}