Abstract: The PORTAL-DOORS System has been designed as a distributed network system with hierarchical authorities for entity registering and attribute publishing of mobile metadata. An alternate bootstrapping design with self-referencing and self-describing features has been implemented with an integrated model for the combined registry-directories that co-exists with the independent model for the separate registries and directories. The concept of multilevel metadata about metadata has been implemented with the use of entity, record, infoset, representation and message metadata. This multilevel metadata about metadata improves the efficiency of search and analysis of the metadata content within the networked system. The methods facilitate search of varying scope both within and across the registries, directories and registry-directories focused on different problem oriented domains. Maintaining the integrity of these problem oriented domains serves to improve the efficiency of search throughout the system.