SDB_Source - Source definition for a property

Sources are expressions that act as base for a view extents, transient properties or properties in view definitions. A source defines an expression, which generates the source data collection or attribute. This might be a collection name (extent or reference name) or a more complex expression.

An order key might be added, when the source refers to a database collection, which provides one or more sort indexes .

When defining sources for view paths, each source definition must have a unique name, which is used to assign the source to the from path having the same name in the view.