Does anyone have any idea about what the lyrics to Led Zeppelin's "Stairway To Heaven" are actually about, and what the words mean?

From Wiki article for Stairway to Heaven

The first attempts at lyrics, written by Led Zeppelin vocalist Robert Plant next to an evening log fire at Headley Grange, were partly spontaneously improvised and Page claimed, "a huge percentage of the lyrics were written there and then".^[7] Jimmy Page was strumming the chords and Robert Plant had a pencil and paper. Plant later said that suddenly,

My hand was writing out the words, 'There's a lady is sure [sic], all that glitters is gold, and she's buying a stairway to heaven'. I just sat there and looked at them and almost leapt out of my seat." Plant's own explanation of the lyrics was that it "was some cynical aside about a woman getting everything she wanted all the time without giving back any thought or consideration. The first line begins with that cynical sweep of the hand ... and it softened up after that.^[11]

The lyrics of the song reflected Plant's current reading. The singer had been poring through the works of the British antiquarian Lewis Spence, and later cited Spence's Magic Arts in Celtic Britain as one of the sources for the lyrics to the song.^[5]