Add to section 3.1 Transformation aggregate (insertions surrounded by *): An aggregate expression may be an expression valid in a $filter system query option on the input set that results in a simple value, e.g. the path to an aggregatable property, with a specified aggregation method, * an aggregatable property, with a specified aggregation method, that can be reached via a path consisting of a sequence of navigation properties, complex properties and complex collection properties. * [...] Update of section 3.10.1 Simple Grouping (insertions surrounded by *): In its simplest form the first parameter of groupby specifies the grouping properties, a comma-separated list of one or more single-valued property paths (paths ending in a single-valued primitive, complex, or navigation property) that is enclosed in parentheses. * A path may consist of a sequence of navigation properties, complex properties and complex collection properties.*