xml-lens:xml-conduit的镜头和遍历

xml镜头 镜头和遍历 。 例子 > doc <- Text.XML. readFile def " examples/books.xml " > doc ^.. root . named " books " ... named " book " . attributeIs " category " " Textbooks " ... named " title " . text [ " Learn You a Haskell for Great Good! " , " Programming in Haskell " , " Real World Haskell " ] > lengthOf ?? doc $ root . named " books " ... named " book " 7 > doc ^? root . named " books " ... attributeI