Missing space separator in exported yin format, in case of list with multiple keys

list described in yang as:
...
list interface-configuration {
...
key "active interface-name";
...

exports via http://localhost:8181/restconf/modules/module/opendaylight-inventory:nodes/node/vpp/yang-ext:mount/Cisco-IOS-XR-ifmgr-cfg/2013-07-22/schema as:
...
<list name="interface-configuration">
...
<key value="activeinterface-name"></key>
...

yang and exported xml are in attachement