Re: [Tracker] rdfq and encoding

[Jamie McCracken <jamiemcc blueyonder co uk>]

Fabien VALLON wrote:
> Jamie McCracken a écrit :
> > Fabien VALLON wrote:
> > > Hi,
> > >
> > > It seems that there is problem with encoding when I query a
> > >
> > > <rdfq:Condition>
> > >   <rdfq:and>
> > >   <rdfq:inSet>
> > >     <rdfq:Property name="File.Format" />
> > >     <rdf:String>audio/wav,audio/x-vorbis+ogg,audio/x-mp3</rdf:String>
> > >   </rdfq:inSet>
> > >   <rdfq:inSet>
> > >     <rdfq:Property name="Audio.Album" />
> > >     <rdf:String>Porgy and Bess</rdf:String>
> > >   </rdfq:inSet>
> > >   </rdfq:and>
> > > </rdfq:Condition>
> > >
> > > works  but
> > >
> > > <rdfq:Condition>
> > >   <rdfq:and>
> > >   <rdfq:inSet>
> > >     <rdfq:Property name="File.Format" />
> > >     <rdf:String>audio/wav,audio/x-vorbis+ogg,audio/x-mp3</rdf:String>
> > >   </rdfq:inSet>
> > >   <rdfq:inSet>
> > >     <rdfq:Property name="Audio.Album" />
> > >     <rdf:String>Albert Collins & Barrelhouse Live</rdf:String>
> > >   </rdfq:inSet>
> > >   </rdfq:and>
> > > </rdfq:Condition>
> > >
> > > complains about :
> > > Error in rdf query parse: Error on line 9: Character ' ' is not valid 
> > > at the start of an entity name; the & character begins an entity; if 
> > > this ampersand isn't supposed to be an entity, escape it as &amp;
> > >
> > > Should the trackerd rdfq parser do the job right ?
> >
> > no we use an xmp parser so the xml needs to be well formed which means 
> > inline ampersands '&', '<' and '>' need to be escaped by you using the 
> > correct xml escape characters.
> You mean it is on the app side to parse before sending the request ?
> I was hoping that it would be done on the server side

You missed the point - you cant parse it on the server or client if its 
invalid xml!

What you must do is check if any value you want to use has illegal 
embedded chars and escape them *before* you construct the xml.

You would have to do this with any xml you generate for any program (and 
not just tracker)


--
Mr Jamie McCracken
http://jamiemcc.livejournal.com/