A system and method for data aggregation and content management are disclosed. The said membrane is used for medical purposes, especially for the haemodialysis, haemofiltration, haemodiafiltration, plasmapherese, immunotherapy, micro- or ultrafiltration or gas separation. A strength of relationship value is calculated for each relationship between the new entity and an entity represented by an existing node and assigned to an edge is created to represent each relationship. A liquid crystal layer is formed between the first and second substrates.