\new and \context clarification

[Menu Jacques]

Hello folks,

musicxml2ly as delivered with LP 2.19.35 produces scores specifications such as:

% The score definition
\score {
    <<
        \new Staff <<
            \context Staff << 
                \context Voice = "PartPOneVoiceOne" { \PartPOneVoiceOne }
                \new Lyrics \lyricsto "PartPOneVoiceOne" 
\PartPOneVoiceOneLyricsOne
                >>
            >>
        
        >>
    \layout {}
    % To create MIDI output, uncomment the following line:
    %  \midi {}
    }

\context Staff inside \new Staff seems to be superfluous, but something 
probably escapes me…

Thank if you can make things clear!

JM