Memory map with vFlashWrite

Hello,

1 - Is the memory map mandatory for using vFlashXxxx commands ?
2 - If yes, how does it works ? Gdb sends a "qSupported" command, then
the stub answers with "qXfer:memory-map:read", then Gdb sends a
"qXfer:memory-map:read::offset,length" and then the stub answers with an
"l data" ?
3 - If the process is correct, what values do we use for offset and
length "qXfer:memory-map:read" command ? Do we send the whole XML file
in the "l data" reply ?

Thanks for your answers.

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Guillaume MENANT