Extracting data from tags in XML resultset

Question

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

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

Answer 1

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 

Answer 2

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

If you want a literal & rather than &, 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