Portal is the absolutely necessary part of many system structures facing service (SOA). So it also introduces the relational conceptions and technology of SOA and SCA that aims at SOA.

There are many problems like various data types and complicated structures in modern big portal system, and these all make it difficult to create a union search platform for the system.

Light steel portal frames have been extensively used for industrial mill buildings in recent years, and much attention is being paid to the fireproofing of steel structures.