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I need to fetch data for 2 tags "estimated" and "fullSign" for all the occurences on this result set.

RESULT SET:

<?xml version="1.0" encoding="UTF-8"?>
<resultSet xmlns="urn:trimet:arrivals" queryTime="1469138325745"><location desc="Morrison/SW 3rd Ave MAX Station" dir="Westbound" lat="45.5181811277907" lng="-122.675385866199" locid="8381" /><arrival block="9007" departed="true" dir="1" status="estimated" estimated="1469138452000" fullSign="MAX  Blue Line to Hillsboro" piece="1" route="100" scheduled="1469138250000" shortSign="Blue to Hillsboro" locid="8381" detour="false"><blockPosition feet="1901" at="1469138300978" heading="201" lat="45.5214364" lng="-122.6716177"><trip desc="Hatfield Government Center" dir="1" route="100" tripNum="6557314" destDist="77046" pattern="54" progress="75145" /></blockPosition></arrival><arrival block="9050" departed="true" dir="1" status="estimated" estimated="1469138664000" fullSign="MAX  Red Line to City Center &amp; Beaverton" piece="1" route="90" scheduled="1469138670000" shortSign="Red Line to Beaverton" locid="8381" detour="false"><blockPosition feet="4552" at="1469138313683" heading="237" lat="45.5277621" lng="-122.6687878"><trip desc="Beaverton TC Pocket" dir="1" route="90" tripNum="6556307" destDist="66321" pattern="15" progress="61769" /></blockPosition></arrival><arrival block="9018" departed="true" dir="1" status="estimated" estimated="1469139140000" fullSign="MAX  Blue Line to Hillsboro" piece="1" route="100" scheduled="1469139150000" shortSign="Blue to Hillsboro" locid="8381" detour="false"><blockPosition feet="13687" at="1469138320005" heading="239" lat="45.5309688" lng="-122.6350333"><trip desc="Hatfield Government Center" dir="1" route="100" tripNum="6557315" destDist="77046" pattern="54" progress="63359" /></blockPosition></arrival><arrival block="9043" departed="true" dir="1" status="estimated" estimated="1469139577000" fullSign="MAX  Red Line to City Center &amp; Beaverton" piece="1" route="90" scheduled="1469139570000" shortSign="Red Line to Beaverton" locid="8381" detour="false"><blockPosition feet="31909" at="1469138310486" heading="285" lat="45.5320383" lng="-122.5738342"><trip desc="Beaverton TC Pocket" dir="1" route="90" tripNum="6556308" destDist="66321" pattern="15" progress="34412" /></blockPosition></arrival></resultSet>

expected result:

1469138452000 MAX  Blue Line to Hillsboro
1469138664000 MAX  Red Line    to City Center &amp; Beaverton 
1469139140000 MAX  Blue Line  to    Hillsboro 
1469139577000 MAX  Red Line to City Center &amp;Beaverton

What is a good way for me to extract this data?

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  • 3
    Start by searching for xmlstarlet here on U&L
    – roaima
    Jul 21, 2016 at 23:38
  • Thanks @Roaima, Tried using xmlstarlet, but maybe regex is incorrect, still unable to fetch the estimated and fullSign values. '/usr/bin/xmlstarlet sel -t -v "/arrival/@estimated" -nl filename.xml'
    – Sunnx
    Jul 22, 2016 at 18:22
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    when you post XML, please try to make it readable with xmltidy or xml_pp or xmlstarlet fo or one of many other similar tools.
    – cas
    Jul 23, 2016 at 6:41
  • for a simple extraction, I'd use xml2 to convert to a line-oriented format so I could use awk or perl or other standard line-oriented text utilities.
    – cas
    Jul 23, 2016 at 6:42
  • Sure, will follow from next time
    – Sunnx
    Jul 25, 2016 at 20:56

2 Answers 2

Reset to default
2

This is using XMLstarlet with paste. It can probably be made in a single call to XMLstarlet, but I'm no wizard:

$ paste <(xml sel -T -t -v '//@estimated' data.xml) \
        <(xml sel -T -t -v '//@fullSign' data.xml)
1469138452000   MAX Blue Line to Hillsboro
1469138664000   MAX Red Line to City Center & Beaverton
1469139140000   MAX Blue Line to Hillsboro
1469139577000   MAX Red Line to City Center & Beaverton
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$ xml2 < sunnx.xml | awk -F= '
   $1 ~ /@fullSign/  { fs=$2 ; sub(/&/,"&amp;",fs) };
   $1 ~ /@estimated/ { est=$2 };
   fs && est         { printf "%s %s\n", est, fs; fs=est="" }'

1469138452000 MAX  Blue Line to Hillsboro
1469138664000 MAX  Red Line to City Center &amp; Beaverton
1469139140000 MAX  Blue Line to Hillsboro
1469139577000 MAX  Red Line to City Center &amp; Beaverton

If you want a literal & rather than &amp;, then get rid of the sub() function call. xml2 decodes the encoded entities for you, so I added the sub() to change it back to conform to your requested output.

Without the sub(), the output looks like this:

1469138452000 MAX  Blue Line to Hillsboro
1469138664000 MAX  Red Line to City Center & Beaverton
1469139140000 MAX  Blue Line to Hillsboro
1469139577000 MAX  Red Line to City Center & Beaverton
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