If you can afford the time to install Nokogiri, this might be a good
direction to take.
It has better mindshare at the moment.
Anyways, could you re-run with the formatting below?
(One typo found).

MarkT

#=================================
require 'rexml/document'
include REXML
class Job
 attr_accessor :client_num, :client_name, :job_num, :job_name

def generate_files()
 client_dir = @client_num.to_s + "_" + @client_name
 job_dir = @job_num.to_s + "_" + @job_name
 unless File.exist?(client_dir) then Dir.mkdir(client_dir) end
 Dir.mkdir(client_dir+"/"+job_dir)
 Dir.mkdir(client_dir+"/"+job_dir+"/parent")
 Dir.mkdir(client_dir+"/"+job_dir+"/parent/old")
 Dir.mkdir(client_dir+"/"+job_dir+"/parent/current")
 Dir.mkdir(client_dir+"/"+job_dir+"/children")
 Dir.mkdir(client_dir+"/"+job_dir+"/children/old")
 Dir.mkdir(client_dir+"/"+job_dir+"/children/current") end end

def declareFiles
 jnumber_file = File.new("XML_EXPORT/export_j_number.xml")
 jname_file = File.new("XML_EXPORT/export_j_name.xml")
 cnumber_file = File.new("XML_EXPORT/export_cnumber.xml")
 cname_file = File.new("XML_EXPORT/export_c_name.xml")
 jnumber_file = Document.new(jnumber_file)
 jname_file = Document.new(jname_file)
 cnumber_file = Document.new(cnumber_file)
 cname_file = Document.new(cname_file) end

j = Job.new
j.client_name = cname
j.client_num = cnumberfile
j.job_name = cname
j.job_num = jname_file
j.declareFiles
puts jnumber_file, jname_file, cnumber_file, cname_file
j.generate_files()
#=================================