The expression in the initial-value attribute is evaluated with a singleton focus based on the root node of the streamed input tree to which the accumulator is being applied.
The word "streamed" is redundant and incorrect; the sentence is also applicable when the input tree is unstreamed.
In §18.2.1
The expression in the initial-value attribute is evaluated with a singleton focus based on the root node of the streamed input tree to which the accumulator is being applied.
The word "streamed" is redundant and incorrect; the sentence is also applicable when the input tree is unstreamed.