[Caml-list] PXP

[Caml-list] PXP

[Gaurav Chanda]

Hello

I am using PXP to parse and validate an XML document. The follwing code 	


<?xml version="1.0"?>
<methodCall>
  <methodName>examples.getStateName</methodName>
  <params>
    <param>
      <value><i4>41</i4></value>
      </param>
    </params>
  </methodCall>

gave this error at runtime: 
  Fatal error: exception Pxp_types.At("In entity [toplevel] = ANONYMOUS, at line 2, position 12:", _)

Could anybody help me solve this problem ?

Gaurav




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Re: [Caml-list] PXP

[Stefano Zacchiroli]

On Tue, Jun 04, 2002 at 09:19:08AM -0700, Gaurav Chanda wrote:
> <?xml version="1.0"?>
> <methodCall>
>   <methodName>examples.getStateName</methodName>
>   <params>
>     <param>
>       <value><i4>41</i4></value>
>       </param>
>     </params>
>   </methodCall>
> 
> gave this error at runtime: 
>   Fatal error: exception Pxp_types.At("In entity [toplevel] = ANONYMOUS, at line 2, position 12:", _)
> 
> Could anybody help me solve this problem ?

Which function are you using to parse the above XML document?
If you are using functions like "parse_document_entity" you will get the
reported error because your XML document is _not_ valid, it doesn't
refer to any DTD.

Fixes:
- use a DTD
- use a non validating parsing, using functions like
  "parse_wfdocument_entity"

Cheers.

-- 
Stefano Zacchiroli - undergraduate student of CS @ Univ. Bologna, Italy
zack@cs.unibo.it | ICQ# 33538863 | http://www.cs.unibo.it/~zacchiro
"I know you believe you understood what you think I said, but I am not
sure you realize that what you heard is not what I meant!" -- G.Romney
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Re: [Caml-list] PXP

[Gerd Stolpmann]

On 2002.06.04 18:19 Gaurav Chanda wrote:
> Hello
> 
> I am using PXP to parse and validate an XML document. The follwing code 	
> 
> 
> <?xml version="1.0"?>
> <methodCall>
>   <methodName>examples.getStateName</methodName>
>   <params>
>     <param>
>       <value><i4>41</i4></value>
>       </param>
>     </params>
>   </methodCall>
> 
> gave this error at runtime: 
>   Fatal error: exception Pxp_types.At("In entity [toplevel] = ANONYMOUS, at line 2, position 12:", _)
> 
> Could anybody help me solve this problem ?

In addition to Stefano's answer: Unfortunately, you do not get the full error message. 
This is an annoying problem of the runtime environment. Try the following code in the 
toploop:

# raise(At("x",WF_error "y"));;
Exception: Pxp_types.At ("x", Pxp_types.WF_error "y").
# try raise(At("x",WF_error "y")) with any -> Failure(Printexc.to_string any);;
- : exn = Failure "Pxp_types.At(_)"
 
If you compile raise(At("x",WF_error "y")), and start the program, you get a third 
variant:

Fatal error: exception Pxp_types.At("x", _)

There are three different built-in routines to print uncaught exceptions, and all three
have different capabilitites, and only one can print nested exceptions.

The workaround for PXP is to use the special exception printer Pxp_types.string_of_exn
like

try
  <your code raising the exception>
with
  error ->
    failwith(Pxp_types.string_of_exn error)

and you get always an exception that can be printed, regardless which printer happens
to catch the exception.

Gerd
-- 
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Re: [Caml-list] PXP

[Alessandro Baretta]

Stefano Zacchiroli wrote:
 >
 > PXP works also with OCaml 3.04 (e.g. the debian package
 > libpxp-ocaml-dev).
 > I don't know if it works also with OCaml CVS.
 >
 > Cheers.
 >

Claudio Sacerdoti Coen wrote:
> 
>  Of course it works also with 3.04.
> 
>  				Cheers,
> 				C.S.C.


Grazie mille!

Alex

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Re: [Caml-list] PXP

[Claudio Sacerdoti Coen]

> I have read PXP *only* works with O'Caml 3.00. Is this 
> _literally_ true? That is, will not work with Ocaml 
> 3.04/OcamlCVS?

 Of course it works also with 3.04.

 				Cheers,
				C.S.C.

-- 
----------------------------------------------------------------
Real name: Claudio Sacerdoti Coen
PhD Student in Computer Science at University of Bologna
E-mail: sacerdot@cs.unibo.it
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Re: [Caml-list] PXP

[Stefano Zacchiroli]

On Mon, Jun 24, 2002 at 10:58:11AM +0200, Alessandro Baretta wrote:
> I have read PXP *only* works with O'Caml 3.00. Is this 
> _literally_ true? That is, will not work with Ocaml 
> 3.04/OcamlCVS?

PXP works also with OCaml 3.04 (e.g. the debian package
libpxp-ocaml-dev).
I don't know if it works also with OCaml CVS.

Cheers.

-- 
Stefano Zacchiroli - undergraduate student of CS @ Univ. Bologna, Italy
zack@cs.unibo.it | ICQ# 33538863 | http://www.cs.unibo.it/~zacchiro
"I know you believe you understood what you think I said, but I am not
sure you realize that what you heard is not what I meant!" -- G.Romney
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[Caml-list] PXP

[Alessandro Baretta]

I have read PXP *only* works with O'Caml 3.00. Is this 
_literally_ true? That is, will not work with Ocaml 
3.04/OcamlCVS?

Alex

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Re: [Caml-list] PXP

[Gerd Stolpmann]

On 2002.05.31 17:58 Gaurav Chanda wrote:
> Hello
> 
> I am working on the implementation of an XMLRPC Server. In order to parse an XML document, I am using PXP (Polymorphic XML Parser). I get no errors during my compilation. However, on executing my code, I am getting the following error: 
> 
> Fatal error: exception Failure ("No lexical analyzer available ! (Badly linked executable?)")
> 
> Could anybody help me solve this problem ??

This is essentially the same as

http://www.ocaml-programming.de/packages/documentation/pxp/index_rel.html

although the error message has been improved in the meantime.

Gerd
-- 
----------------------------------------------------------------------------
Gerd Stolpmann      Telefon: +49 6151 997705 (privat)
Viktoriastr. 45             
64293 Darmstadt     EMail:   gerd@gerd-stolpmann.de
Germany                     
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[Caml-list] PXP

[Gaurav Chanda]

Hello

I am working on the implementation of an XMLRPC Server. In order to parse an XML document, I am using PXP (Polymorphic XML Parser). I get no errors during my compilation. However, on executing my code, I am getting the following error: 

Fatal error: exception Failure ("No lexical analyzer available ! (Badly linked executable?)")

Could anybody help me solve this problem ??

Gaurav



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