[xsd-users] Why this error?

[Al Niessner]

Message does not help me much more:

:1:13 error: Unterminated processing instruction

If it is referring to the XML, all the tags that I see are terminated.
Does it mean something different to you?

On Thu, 2007-03-08 at 09:42 +0200, Boris Kolpackov wrote:
> Hi Al,
> 
> Al Niessner <Al.Niessner at jpl.nasa.gov> writes:
> 
> > I then wrote a bunch of C++ code that looks very similar to my Java and
> > Python code to parse some XML. It did not work at all. I get this error
> > message:
> >
> > terminate called after throwing an instance of
> > 'xsd::cxx::tree::parsing<char>'
> >   what(): instance document parsing failed.
> 
> It is usually a good idea to catch the exception and print it to get
> a better idea about what went wrong. Here is what I did:
> 
>   try
>   {
>     msg = ExternalTool (ss, xml_schema::flags::dont_validate);
>   }
>   catch (const xml_schema::exception& e)
>   {
>     std::cerr << e << std::endl;
>   }
> 
> After this change I got a more descriptive error:
> 
> 1:13 error: Unterminated processing instruction
> 
> For some reason it does not like your XML declaration
> (<?xml version="1.0" encoding="UTF-8" standalone="yes"?>) since that's
> the only processing instruction in this document.
> 
> Because you are first reading the contents of the file into a string
> buffer, let's check if the XML is still good in that buffer. I added
> 
>   std::cout << fullText << std::endl;
> 
> Before the above code. It prints:
> 
> <?xmlversion="1.0"encoding="UTF-8"standalone="yes"?><ExternalTool>...
> 
> The XML declaration does not look right anymore: all whitespaces are
> gone. Looking at the code that fills the buffer we can see what's
> going on:
> 
>   while (!fin.eof())
>     {
>       fin >> buffer;
>       fullText += buffer;
>     }
> 
> fin >> buffer reads one word at a time, stripping leading and trailing
> whitespaces. Here is a version that reads in an exact copy of the file.
> It is also a bit more efficient:
> 
>   fin.open ("msg.xml", std::ios::in | std::ios::ate);
>   std::size_t size (fin.tellg ());
>   fin.seekg (0, std::ios::beg);
> 
>   fullText.reserve (size);
> 
>   while (size != 0 && !fin.eof ())
>   {
>     char buf[1024];
>     fin.read (buf, size < sizeof (buf) ? size : sizeof (buf));
>     std::size_t n = fin.gcount ();
> 
>     fullText.append (buf, n);
>     size -= n;
>   }
> 
>   fin.close();
> 
> After making this change the file parses without any problems.
> You probably know that, but just in case, you can parse the file
> directly without first reading it into a buffer. Both:
> 
>   msg = ExternalTool ("msg.xml", xml_schema::flags::dont_validate);
> 
> and
> 
>   fin.open ("msg.xml");
>   msg = ExternalTool (fin, xml_schema::flags::dont_validate);
>   fin.close();
> 
> work.
> 
> 
> hth,
> -boris
-- 
Al Niessner
818.354.0859

All opinions stated above are mine and do not necessarily reflect those
of JPL or NASA.

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