[xsd-users] Why this error?

[Al Niessner]

This seems to be an error propagating up from xceres-c 2.7. It does not
something about the line

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

I have no idea what it thinks is wrong, but from the message I would
guess that its failure point is '=' at column 13. Given my quality at
parsing XML, I would say that it is a valid line of XML. JaxB and
generateDS would agree.

On Thu, 2007-03-08 at 13:48 -0800, Al Niessner wrote:
> 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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