Well-structured data like this is better encapsulated in XML:

    <?xml version="1.0" encoding="UTF-8"?>
        <address street="Church Street">
    	<specifiers>
    	    <key length=""/>
        	<value type="uint32" scale="nanolightseconds">5</value>
    		<city>
        	    <![CDATA[ 
            		<?xml version="1.0" encoding="ISO-8859-15"?>
                    <name>Church City</name> 
    	        ]]>
    	    </city>
    	</specifiers>
    </address>

Isn't that much more legible and understandable?

(I hate XML. So much. This shouldn't be a valid document in any language.)