Returns Properties object containing attributes from within the element requested by tagName
For use when the user knows that there is only one occurrance of the requested tagName within the XML document.
Returns Properties object containing attributes from within the occurance of the element requested by tagName when its Attribute compAttr is equal to the value requested in compValue.
Returns List of Properties objects containing attributes from within the occurance of the element requested by the tagTree list, when its respective attribute compAttr is equal to the respective value in compValue.