XML parser

bad_ceki.xml

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:ns2="http://www.opentravel.org/OTA/2003/05">
	<SOAP-ENV:Header>
		<ns1:Security>true</ns1:Security>
	</SOAP-ENV:Header>
	<SOAP-ENV:Body>
		<ns2:OTA_HotelAvailNotifRS TimeStamp="2017-07-20T10:47:34+00:00">
			<ns2:Errors>
				<ns2:Error Code="1" ShortText="Invalid Room Code : ROOM2410" Type="3"/>
			</ns2:Errors>
		</ns2:OTA_HotelAvailNotifRS>
	</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

ceki.rb

module Import
  module Origin
    module Xml
      module Parse
        class Ceki < Base
          param :success, element: 'ns2:Success'

          has_many :errors, element: 'ns2:Errors//ns2:Error', parser: CekiError

          def success?
            success.nil? ? false : true
          end
        end
      end
    end
  end
end

ceki_error.rb

module Import
  module Origin
    module Xml
      module Parse
        class CekiError < Base
          param :code, element: 'Code', attribute: true
          param :description, element: 'ShortText', attribute: true
        end
      end
    end
  end
end

ceki_spec.rb

describe Import::Origin::Xml::Parse::Ceki do
  let(:parser) { described_class.new(node) }

  context 'success' do
    let(:node) { xml_element(:good_ceki, name: 'ns2:OTA_HotelAvailNotifRS') }

    let(:params) { { success: '' } }

    it 'responds to params and errors' do
      expect(parser.params).to eq params
      expect(parser.errors.size).to eq 0
    end

    it 'success?' do
      expect(parser.success?).to eq true
    end
  end

  context 'errors' do
    let(:node) { xml_element(:bad_ceki, name: 'ns2:OTA_HotelAvailNotifRS') }

    let(:params) { { success: nil } }

    it 'responds to params and errors' do
      expect(parser.params).to eq params
      expect(parser.errors.size).to eq 1
    end

    it 'success?' do
      expect(parser.success?).to eq false
    end

    describe 'errors' do
      it 'contains correct values' do
        error = parser.errors.first
        expect(error.code).to eq '1'
        expect(error.description).to eq 'Invalid Room Code : ROOM2410'
      end
    end
  end
end

good_ceki.xml

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" xmlns:ns2="http://www.opentravel.org/OTA/2003/05">
	<SOAP-ENV:Header>
		<ns1:Security>true</ns1:Security>
	</SOAP-ENV:Header>
	<SOAP-ENV:Body>
		<ns2:OTA_HotelAvailNotifRS TimeStamp="2017-07-20T10:47:34+00:00">
			<ns2:Success/>
		</ns2:OTA_HotelAvailNotifRS>
	</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

Usage would be:
log_xml = PhobsLog.find(1).response_data
parser = Import::Origin::Xml::Parse::Ceki.new(log_xml)
parser.success? # returns true if response is successful, false otherwise
parser.errors.first.description # returns "Invalid Room Code : ROOM2410" in case of bad_ceki.xml

One step missing, the parser needs to receive a XML element (node), which you can get like this:

Nokogiri::XML(PhobsLog.find(1).response_data) { |config| config.strict.noblanks }