pattern matching with namespaces and another question

Forgot the "another" question.
Sleep deprivation can do that to you :)
Is there a simple way to do a copy of a XML and only
changing/adding/removing the namespace in the XML tree?

2009/7/13 Alexandre :
> Hi
>
> In scala, since one can do pattern matching with XML literals, one
> would assume that it is possible to do pattern matching with XML
> literals with a namespace. At least I assumed that, wrongly.
> to see what I mean check these two examples:
>
> Example 1: without namespaces
> scala> val htm =     xhtml="http://www.w3.org/1999/xhtml">aaa
> htm: scala.xml.Elem = aaa
>
> scala> htm match { case {a} => true; case _ => false;}
> res19: Boolean = true
>
> Example 2: with namespaces it does not work
> scala> val htm =     xhtml="http://www.w3.org/1999/xhtml">aaa
> htm: scala.xml.Elem = aaa
>
> scala> htm match { case xmlns="http://www.w3.org/1999/xhtml">{a} => true; case _ =>
> false;}
> :1: error: in XML literal: '>' expected instead of 'x'
>       htm match { case xmlns="http://www.w3.org/1999/xhtml">{a} => true; case _ =>
> false;}
>                             ^
>
>
> I'm trying to work around this by using the scala.xml.Elem contructor
> directly but it would be so much more convenient if I could use
> scala's XML literals.
> Am I doing anything wrong?
>
> Best regards
> Alexandre Martins
>

Alexandre wrote:
> I'm trying to work around this by using the scala.xml.Elem contructor
> directly but it would be so much more convenient if I could use
> scala's XML literals.
> Am I doing anything wrong?
>
Unfortunately, the only thing you're doing wrong is expecting this to
work. :/

This topic comes up frequently and I wish I could say that progress was
likely to happen soon... Even before anyone can take a crack at
implementation, we need a concrete proposed syntax and semantics for
match expressions involving namespaces. Since I seem to be the guy who
always says "I think it should look/work like this" every time this
topic comes up, I suspect this is my job. :) Very little time though. :/

The best first step is to file an enhancement request in trac, which
I've done: https://lampsvn.epfl.ch/trac/scala/ticket/2156

-0xe1a

Alexandre wrote:
> Forgot the "another" question.
> Sleep deprivation can do that to you :)
> Is there a simple way to do a copy of a XML and only
> changing/adding/removing the namespace in the XML tree?
>
http://www.scala-lang.org/docu/files/api/scala/xml/transform/RuleTransfo...
is probably a good place to start...

-0xe1a

Hi again

> This topic comes up frequently and I wish I could say that progress was
> likely to happen soon... Even before anyone can take a crack at
> implementation, we need a concrete proposed syntax and semantics for match
> expressions involving namespaces.  Since I seem to be the guy who always
> says "I think it should look/work like this" every time this topic comes up,
> I suspect this is my job. :)  Very little time though. :/
I can understand that. I'm sorry I cannot help here but I'm still not
knowledgeable enough to be useful.

> The best first step is to file an enhancement request in trac, which I've
> done: https://lampsvn.epfl.ch/trac/scala/ticket/2156

Up voted it already.

Thanks
Alexandre Martins