Implement Query parameters - filter

RESTCONF Protocol draft-ietf-netconf-restconf-09

"filter" Parameter

The following URIs show some examples of notification filter
specifications (lines wrapped for display purposes only):

// filter = /event/event-class='fault'
GET /streams/NETCONF?filter=%2Fevent%2Fevent-class%3D'fault'

// filter = /event/severity<=4
GET /streams/NETCONF?filter=%2Fevent%2Fseverity%3C%3D4

// filter = /linkUp|/linkDown
GET /streams/SNMP?filter=%2FlinkUp%7C%2FlinkDown

// filter = /*/reporting-entity/card!='Ethernet0'
GET /streams/NETCONF?
filter=%2F*%2Freporting-entity%2Fcard%21%3D'Ethernet0'

// filter = /*/email-addr[contains(.,'company.com')]
GET /streams/critical-syslog?
filter=%2F*%2Femail-addr[contains(.%2C'company.com')]

// Note: the module name is used as prefix.
// filter = (/example-mod:event1/name='joe' and
// /example-mod:event1/status='online')
GET /streams/NETCONF?
filter=(%2Fexample-mod%3Aevent1%2Fname%3D'joe'%20and
%20%2Fexample-mod%3Aevent1%2Fstatus%3D'online')

// To get notifications from just two modules (e.g., m1 + m2)
// filter=(/m1:* or /m2:*)
GET /streams/NETCONF?filter=(%2Fm1%3A*%20or%20%2Fm2%3A*)