This object contains additional identification information
about the physical entity. The object contains URIs and,
therefore, the syntax of this object must conform to RFC
3986, section 2.
Multiple URIs may be present and are separated by white
space characters. Leading and trailing white space
characters are ignored.
If no additional identification information is known
about the physical entity or supported, the object is not
instantiated. A zero length octet string may also be
returned in this case.