Groovy XML SLurper can't access child node - groovy

Question

I've recently started using XML Slurper and am trying to access a specific child node from a SOAP envelope. Below is an extract of the XML I'm working with:
<cons:ConsumerName>
<cons:FirstName>Robert</cons:FirstName>
<cons:MiddleName>John</cons:MiddleName>
<cons:FamilyName>Smith</cons:FamilyName>
</cons:ConsumerName>
<cons:ContactPersonName>
<cons:FirstName>William</cons:FirstName>
<cons:MiddleName>Michael</cons:MiddleName>
<cons:FamilyName>Doe</cons:FamilyName>
</cons:ContactPersonName>
I'm trying to access the value of FirstName in the ConusmerName block, I've only been able to get a list of both of the first name values by using:
def block = new XmlSlurper().parseText(text).'**'.findAll{it.name()=='FirstName'}
I tried to get the first name for the ConsumerName block only, by using:
def block = new XmlSlurper().parseText(text).'ConsumerName'.findAll{it.name()=='FirstName'}
But nothing gets returned by that, I can't work out what I'm doing wrong?

Answer 1

I fixed up your xml and providing an answer here:
def text = '<?xml version="1.0" encoding="UTF-8"?>' +
'<cons:Consumer xmlns:cons="urn:corp:cons">' +
' <cons:ConsumerName>' +
' <cons:FirstName>Robert</cons:FirstName>' +
' <cons:MiddleName>John</cons:MiddleName>' +
' <cons:FamilyName>Smith</cons:FamilyName>' +
' </cons:ConsumerName>' +
'' +
' <cons:ContactPersonName>' +
' <cons:FirstName>William</cons:FirstName>' +
' <cons:MiddleName>Michael</cons:MiddleName>' +
' <cons:FamilyName>Doe</cons:FamilyName>' +
' </cons:ContactPersonName>' +
'</cons:Consumer>'
def consumer = new XmlSlurper().parseText(text)
println "Consumer first name: ${consumer.ConsumerName.FirstName}"
Output:
Consumer first name: Robert

Answer 2

To get the firstName value in the ConsumerName block of XML, I used the following:
def text = new File(requestFilePath).text
def fieldValue = new XmlSlurper().parseText(text).'**'.findAll{it.name()==tagBlockName}.getAt(tagName)[0]
def var = (String)fieldValue