class RubyXL::OOXMLTopLevelObject

def self.set_namespaces(namespace_hash)

'http://schemas.openxmlformats.org/officeDocument/2006/relationships' => 'r')
set_namespaces('http://schemas.openxmlformats.org/spreadsheetml/2006/main' => '',
==== Examples
* +namespace_hash+ - Hash of namespaces in the form of "url" => "prefix"
=== Parameters
Sets the list of namespaces on this object to be added when writing out XML. Valid only on top-level objects. 
def self.set_namespaces(namespace_hash)
  self.class_variable_set(:@@ooxml_namespaces, namespace_hash)
end