Pretending is an important part developing abstract thought, such as connecting symbols with real objects and events.
2.
In its first edition in 1905, the UDC already included many features that were revolutionary in the context of knowledge classifications : tables of generally applicable ( aspect-free ) concepts called common auxiliary tables; a series of special auxiliary tables with specific but re-usable attributes in a particular field of knowledge; an expressive notational system with connecting symbols and syntax rules to enable coordination of subjects and the creation of a documentation language proper.
मोबाइल