I have this xml file, and i am trying to use xmllint or grep to get an out put like this

availStart="2024-05-24T05:00:30" availId="811220455" q1:campaignIdRef=180398
availStart="2024-05-24T05:13:41" availId="811220484" q2:campaignIdRef=179163
availStart="2024-05-24T05:13:41" availId="811220484" q2:campaignIdRef=179166
availStart="2024-05-24T05:13:41" availId="811220484" q2:campaignIdRef=179164
availStart="2024-05-24T05:13:41" availId="811220484" q2:campaignIdRef=179165

The XML file is below, i tried using while read Line method and some grep commands but not getting the full capture. Also xmllint im struggling to use the xpath or path option. can anyone help?

<?xml version="1.0" encoding="utf-8"?>
<Schedule xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="urn:scte:118:version01" level="0" revision="1" zoneName="test" networkName="XXX" schemaVersion="urn:scte:118:version01" begDateTime="2024-05-24T06:00:00" broadcastDate="20240524" endDateTime="2024-05-25T05:59:59">
  <Window windowStart="2024-05-24T04:00:30" windowDuration="02000000">
    <Avail xmlns:q1="urn:nds:dynamic:ruleManagerICD:01:01" xsi:type="q1:NDSAvailType" availStart="2024-05-24T05:00:30" availInWindow="1" availId="811220455" eventKey="811220455" durationFrames="0" durationSeconds="15" framesPerSecond="25Frames" breakId="1">
      <Spot xsi:type="q1:SpotRulesType" spotId="1" length="00001500" positionInAvail="1" trafficId="312999" eventType="LOI" lengthFrames="0">
        <q1:substitutionOptionSlot>
          <q1:adInSpot>
            <q1:campaignRef>
              <q1:campaignIdRef>180398</q1:campaignIdRef>
            </q1:campaignRef>
          </q1:adInSpot>
        </q1:substitutionOptionSlot>
      </Spot>
      <q1:inactivityTime primaryDevice="7200" secondaryDevice="5400"/>
    </Avail>
  </Window>
  <Window windowStart="2024-05-24T04:13:41" windowDuration="02000000">
    <Avail xmlns:q2="urn:nds:dynamic:ruleManagerICD:01:01" xsi:type="q2:NDSAvailType" availStart="2024-05-24T05:13:41" availInWindow="1" availId="811220484" eventKey="811220484" durationFrames="0" durationSeconds="10" framesPerSecond="25Frames" breakId="2">
      <Spot xsi:type="q2:SpotRulesType" spotId="1" length="00001000" positionInAvail="1" trafficId="312999" eventType="LOI" lengthFrames="0">
        <q2:substitutionOptionSlot>
          <q2:adInSpot>
            <q2:campaignRef>
              <q2:campaignIdRef>179163</q2:campaignIdRef>
            </q2:campaignRef>
            <q2:campaignRef>
              <q2:campaignIdRef>179166</q2:campaignIdRef>
            </q2:campaignRef>
            <q2:campaignRef>
              <q2:campaignIdRef>179164</q2:campaignIdRef>
            </q2:campaignRef>
            <q2:campaignRef>
              <q2:campaignIdRef>179165</q2:campaignIdRef>
            </q2:campaignRef>
          </q2:adInSpot>
        </q2:substitutionOptionSlot>
      </Spot>
      <q2:inactivityTime primaryDevice="7200" secondaryDevice="5400"/>
    </Avail>
  </Window>
</Schedule>

I tried this but i am not getting any value in $avail varibale. only the first variable $time is getting filled

while read LINE; do time=grep -io -P ‘availstart=.{20}’ && avail=grep -io -P ‘availId=.{11}’;echo -e "n$time and $avail";done < sample.xml