What i wanted to do

From the xml file provided by the Japan Meteorological Agency with Ruby rexml I am trying to get the alarm information and make some judgment according to the situation.

Ruby 2.6.3 require 'rexml/document'

What didn't work

Parse the following files and put them in doc.

<?xml version="1.0" encoding="UTF-8"?>
<Report xmlns="http://xml.kishou.go.jp/jmaxml1/" xmlns:jmx="http://xml.kishou.go.jp/jmaxml1/" xmlns:jmx_add="http://xml.kishou.go.jp/jmaxml1/addition1/">
--- Omitted between ---
  <Head xmlns="http://xml.kishou.go.jp/jmaxml1/informationBasis1/">
--- Omitted between ---
    <Headline>
      <Text>In Osaka Prefecture, be careful of landslides, severe gusts such as tornadoes, and lightning strikes.</Text>
      <Information type="Weather warnings / warnings (prefectural forecast areas, etc.)">
        <Item>
          <Kind>
            <Name>Heavy rain warning</Name>
            <Code>10</Code>
          </Kind>
          <Kind>
            <Name>Lightning warning</Name>
            <Code>14</Code>
          </Kind>
          <Areas codeType="Meteorological information / prefecture forecast zone, subdivision area, etc.">
            <Area>
              <Name>Osaka</Name>
              <Code>270000</Code>
            </Area>
          </Areas>
        </Item>
      </Information>
Less than,<Information>Followed by

I want to turn each statement with the element , so first

item = doc.elements['//Item']
item.each do |kind|
puts kind
end

This caused a problem because the each statement was sent to all the child elements.

I found two solutions by asking questions on other sites.

--Use REXML :: XPath.match (answered)

require 'rexml/document'

doc = REXML::Document.new(File.read('index.xml'))

kinds = REXML::XPath.match(doc, '/Item/Kind')

kinds.each do |kind|
  puts kind.to_s
end

--Use get_elements (self-solving)

doc=REXML::Document.new(open(osaka.xml))

doc.get_elements('//Information/Item/Kind') do |kind|
  puts kind
end

Next challenge

The results were the same for both, but what's the difference? Find out if both are the same.

reference

https://docs.ruby-lang.org/ja/latest/method/REXML=3a=3aElement/i/get_elements.html

Ruby / rexml: Turn each with an element with the same name

What i wanted to do

What didn't work

I found two solutions by asking questions on other sites.

Next challenge

reference