Hi Uwe Schmidt, thanks a lot.
Just one more question, I didn't find any example describing how to get the
text information of a XML element in the picklers tutorial. So, if the use case
element is described as follwing:
<useCase>
<id>UC_01</id>
<name>Opening ...</name>
<description>This use case describes how...</description>
</useCase>
How can I set the id, name and desription of a use case?
-- use case data type
data UseCaseModel = UCM Name [UseCase]
data UseCase = UseCase Id Name Description deriving (Show)
-- I tried the following picler implementation
-- but I think that it is not correct.
instance XmlPickler UseCase where
xpickle = xpUseCase
xpUseCase :: PU UseCase
xpUseCase =
xpElem "useCase" $
xpWrap ( \ (i, n, d) -> UseCase i n d,
\t -> (ucId t, name t, description t)) $
(xpTriple (xpElem "id" xpText)
(xpElem "name" xpText)
(xpElem "description" xpText))
> Hi Rodrigo,
>
> > I´m just starting with HXT. My question is, how can I expose a "use case"
> > from the main function below (the XmlPickler for UseCase has been already
> > defined):
> >
> > main :: IO ()
> > main = do
> > runX ( xunpickleDocument xpUseCase [ (a_validate,v_0) ], "uc.xml" )
> > return ()
> >
> > For example, if I just want to show the use case contents, how can I call
> > "show" for a retrived use case.
>
> -------------------------------------
>
> 1. version
>
> main :: IO ()
> main = do
> [x] <- runX ( xunpickleDocument xpUseCase [ (a_validate,v_0) ],
> "uc.xml" )
> print x
> return ()
>
> x is processed outside the arrow
>
> -------------------------------------
> 2. version
>
> main :: IO ()
> main = do
> runX ( xunpickleDocument xpUseCase [ (a_validate,v_0) ], "uc.xml"
> >>>
> arrIO print
> )
> return ()
>
> x is processed within an arrow by lifting the print function to then arrow
> level.
>
> ------------------------------------
>
> There is a new wiki page about picklers
> http://www.haskell.org/haskellwiki/HXT/Conversion_of_Haskell_data_from/to_XML
>
> Cheers,
>
> Uwe
>
> --
>
> Uwe Schmidt
> Web: http://www.fh-wedel.de/~si/
>
-----------------------------------
Rodrigo Bonifácio de Almeida
Universidade Católica de Brasília
- Grupo de Engenharia de Software
- JavaComBr (www.ucb.br/java)
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