xhtml-1.0 transitional and xmerl?

[Bertil Karlsson]

Hi,

It is not true that external entities are not supported. In the Release 
Notes you can read that there is no support to fetch external entities 
that are referenced by a URL. By this I ment that it is no built-in 
support for that, but you can still provide your own fetch function that 
  manage this.

However, it is something that fails when using the xhtml DTDs. I have 
not yet got a clear picture about what has to be done to manage those 
DTDs. The first bug I run into was when parsing the comments in one of 
the referenced entites that enclosed an entity definition, ... but there 
were something more.

I hope to deliver a patched version in the march release of the open 
source OTP.

/Bertil

Joakim G. wrote:
> Hi,
> I tried to validate couple of xhtml-1.0 pages with xmerl. I downloaded
> the xhtml-1.0 transitional DTDs from:
> http://www.w3.org/TR/xhtml1/dtds.html#a_dtd_XHTML-1.0-Transitional and
> tried to use them with xmerl:
> 
> ====
> 
> Erlang (BEAM) emulator version 5.4.3 [source] [hipe]
> 
> Eshell V5.4.3  (abort with ^G)
> 1> xmerl_scan:file("test.html", [{validation, true}, {fetch_fun, fun(U, 
> G) -> {ok, {file, "xhtml1-transitional.dtd"}, G} end}]).
> 2748- fatal: {invalid_name," HTMLl"}
> ** exited: {fatal,{{invalid_name," 
> HTMLl"},"xhtml1-transitional.dtd",29,700}} **
> ====
> 
> Hmm. Sifting through the xmerl release notes I realised that external
> entities isn't supported. Just for the heck of it I replaced the
> external entity references in the DTD with the actual content and
> tried again:
> 
> ====
> 
> Erlang (BEAM) emulator version 5.4.3 [source] [hipe]
> 
> Eshell V5.4.3  (abort with ^G)
> 1> xmerl_scan:file("test.html", [{validation, true}, {fetch_fun, fun(U, 
> G) -> {ok, {file, "xhtml1-transitional.dtd"}, G} end}]).
> 3319- fatal: unexpected_end
> ** exited: {fatal,{unexpected_end,"xhtml1-transitional.dtd",635,111}} **
> 2>
> 
> ====
> 
> It was doomed to fail I suppose.
> 
> My question: Has anyone else used xmerl in combination with the xhtml-1.0
> DTDs?
> 
> Cheers
> /Jocke
> 
>