The full directory path where this element is installed.
For example, the value would be '/opt/EMPuma/bin' for an
element installed in the directory '/opt/EMPuma/bin'.
Most application packages include information about the
elements contained in the package. In addition, elements
are typically installed in sub-directories under the
package installation directory. In cases where the
element path names are not included in the package
information itself, the path can usually be determined
by a simple search of the sub-directories. If the
element is not installed in that location and there is
no other information available to the agent implementation,
then the path is unknown and null is returned.