from - View data source

The view data source is defined by one or more input collections (outer join or product set). Each collection is either a property (path) or an operation in the global context or in the context of the calling object data type. The view data source type inherits from the data type of all collections in the list.

When a collection data source refers to a property path (like 'a.b.c' or a.b(0).c'), the collection data source inherits from all element data types (in this case from data type of 'ä', 'b' and 'c'). In order to avoid ambiguity, member references in collection data sources may be preceded by element names (e.g. 'a.name' and 'b.name').

When no collection data source is defined, a collection with the given name is assumed to be defined in the calling object data type.