* if the file does not exist or cannot be read.
*/
public String readExternalFile(IMXMLTagAttributeData sourceAttribute,
String resolvedSourcePath)
{
final IFileSpecificationGetter fileSpecGetter = getFileSpecificationGetter();
IFileSpecification sourceFileSpec =
fileSpecGetter.getFileSpecification(resolvedSourcePath);
Reader sourceFileReader;
try
{
sourceFileReader = sourceFileSpec.createReader();
}