The node system has been upgraded to allow a single module to define more than one type of node. This will allow some of the more convoluted code in, for example, project.module to be tidied up.
_node()hook has been deprecated. In its place, modules that define nodes should use
_node_name()function should return a translated string containing the human-readable name of the node type.
_help()function, when called with parameter
"node/add#modulename", should return a translated string containing the description of the node type.