Github user srowen commented on a diff in the pull request:
    --- Diff: 
    @@ -121,8 +176,19 @@ case class XPathFloat(xml: Expression, path: 
Expression) extends XPathExtract {
    -  usage = "_FUNC_(xml, xpath) - Returns a double value that matches the 
xpath expression",
    -  extended = "> SELECT _FUNC_('<a><b>1</b><b>2</b></a>','sum(a/b)');\n3.0")
    +  usage =
    +    """
    +      _FUNC_(xml, xpath) - Returns a short value that matches the xpath 
    +        Arguments:
    +          xml - string type that represents XML documentation.
    +          path - string type literal that represents xpath expression.
    --- End diff --
    documentation -> document?
    xpath -> XPath
    (Here and in a few other places)

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