Added README example on using CSS selectors.
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@ -70,6 +70,12 @@ Querying a document using XPath:
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document.xpath('string(people/person)') # => "Alice"
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Querying a document using CSS:
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document = Oga.parse_xml('<people><person>Alice</person></people>')
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document.css('people person') # => NodeSet(Element(name: "person" ...))
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Modifying a document and serializing it back to XML:
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document = Oga.parse_xml('<people><person>Alice</person></people>')
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