FHIR XML transform to make more golang friendly

bundle.xml

<Bundle xmlns="http://hl7.org/fhir">
  <id value="10bb101f-a121-4264-a920-67be9cb82c74"/>
  <type value="message"/>
  <entry>
    <fullUrl value="urn:uuid:267b18ce-3d37-4581-9baa-6fada338038b"/>
    <resource>
      <MessageHeader>
        <id value="efdd254b-0e09-4164-883e-35cf3871715f"/>
        <timestamp value="2015-12-08T11:15:33-05:00"/>
        <event>
          <system value="https://github.com/pophealth/fhir/message-events"/>
          <code value="record-match"/>
        </event>
        <source>
          <endpoint value="https://acme.com/pophealth"/>
        </source>
        <destination>
          <endpoint value="http://acme.com/record-matcher"/>
        </destination>
        <author>
          <endpoint value="urn:uuid:15121321-4af5-424c-a0e1-ed3aab1c350a"/>
        </author>
        <data>
          <reference value="urn:uuid:15121321-4af5-424c-a0e1-ed3aab1c348e"/>
        </data>
      </MessageHeader>
    </resource>
  </entry>

  <entry>
     <fullUrl value="urn:uuid:15121321-4af5-424c-a0e1-ed3aab1c348e"/>
     <resource>
      <Parameters>
        <parameter>
          <name value="type"/>
          <valueString value="master"/>
        </parameter>
        <parameter>
          <name value="resourceType"/>
          <valueString value="Patient"/>
        </parameter>
        <parameter>
          <name value="searchExpression" />
          <resource>
            <Parameters>
              <parameter>
                <name value="resourceUrl"/>
                <valueUri value="http://acme.com/popHealth/fhir/Patient"/>
              </parameter>
              <parameter>
                <name value="name"/>
                <valueString value="jon"/>
              </parameter>
            </Parameters>
          </resource>
        </parameter>
      </Parameters>
    </resource>
  </entry>

  <entry>
    <fullUrl value="urn:uuid:15121321-4af5-424c-a0e1-ed3aab1c350a"/>
    <resource>
      <Practitioner>
        <identifier>
          <use value="usual"/>
          <system value="https://github.com/pophealth/users" />
          <value value="user1" />
        </identifier>
      </Practitioner>
    </resource>
  </entry>

</Bundle>

fhirxml.go

package main

import (
	"bytes"
	"encoding/xml"
	"os"
)

func main() {
	var b bytes.Buffer
	bundle, err := os.Open("bundle.xml")
	if err != nil {
		panic(err.Error())
	}
	decoder := xml.NewDecoder(bundle)
	encoder := xml.NewEncoder(&b)
	for {
		token, _ := decoder.Token()
		//fmt.Println(token)
		if token == nil {
			break
		}
		switch startElement := token.(type) {
		case xml.StartElement:
			fhirValue := findValue(startElement.Attr)
			if fhirValue != "" {
				encoder.EncodeElement(fhirValue, xml.StartElement{Name: startElement.Name})
				decoder.Skip()
			} else {
				encoder.EncodeToken(startElement)
			}
		default:
			encoder.EncodeToken(token)
		}
	}
	encoder.Flush()
	b.WriteTo(os.Stdout)
}

func findValue(attr []xml.Attr) string {
	for _, a := range attr {
		if a.Name.Local == "value" {
			return a.Value
		}
	}
	return ""
}