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A comment on Jsonpath – a query language for JSON in Postgres [pdf]. Parent comment
John Clements's packaging of SXPath for Racket might be the most accessible way to first look at it: https://docs.racket-lang.org/sxml/sxpath.html
Then Kiselyov's original writings: http://okmij.org/ftp/Scheme/xml.html#SXPath
Before Web browsers had nice developer tools in them, I made a little aid for crafting SXPath queries, for HTML scraping: https://www.neilvandyke.org/racket/webscraperhelper/
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John Clements's packaging of SXPath for Racket might be the most accessible way to first look at it: https://docs.racket-lang.org/sxml/sxpath.html
Then Kiselyov's original writings: http://okmij.org/ftp/Scheme/xml.html#SXPath
Before Web browsers had nice developer tools in them, I made a little aid for crafting SXPath queries, for HTML scraping: https://www.neilvandyke.org/racket/webscraperhelper/