"using the from together with either the to attributes, or the dur (duration) attribute:"
Comment: The plural "attributes" is wrong. The string "the from together with either the to" is a bit hard to construe!
Suggestion: "using the from attribute together with either the to attribute, or the dur attribute:" Of course one could also write: "using @from together with either @to, or @dur:" - this might easiest to read.
Since @dur has been used many times already, there is no need to expand it here. It is expanded on 438.