[Haskell-cafe] Re: HXT Namespaces and XPath

[Mads Lindstrøm]

Hi

Replying to myself:


> I think another example will clarify my point. The code:
> 
> simpleXmlOne, simpleXmlTwo :: String
> simpleXmlOne = "<a:Foo xmlns:a=\"http://foo.org\"/>"
> simpleXmlTwo = "<b:Foo xmlns:b=\"http://foo.org\"/>"
> 
> nsEnv :: [(String, String)]
> nsEnv = [ ("notFoo"    , "http://notfoo.org") ]
> 
> evalXPath :: String -> [XmlTree]
> evalXPath xml =
>   runLA ( xread
>           >>> propagateNamespaces
>           >>> getXPathTreesWithNsEnv nsEnv "//a:Foo"
>         ) xml
> 
> Now notice that simpleXmlOne and simpleXmlTwo are equivalent. Yes, they
> have a different prefix for "http://foo.org", but the documents means
> the same. And as you write yourself, "... the prefix is no longer
> releavant ..." Yet:
> 
> evalXPath simpleXmlOne /= evalXPath simpleXmlTwo
> 

Just to clarify things. The point I am making is that:

getXPathTreesWithNsEnv nsEnv "//a:Foo"

do not only see the prefixes in 'nsEnv', but also the prefixes in the
XML it is applied to. I think that the getXPathTreesWithNsEnv function
should only see the prefixes mentioned in its first parameter.


Regards,

Mads

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