When publish the information, a description document –
IIDL document must be created, and the descriptor contains
meta-information about the information, and is deployed on a
IIS server whose LR is executed and store meta-data about the
descriptor in LR. LR request IRS to register the information.
GR may get the meta-information of the information. When
discover the information, clients invocate the IRS and get the
meta-information about the specified information within it