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XMLWF(1) XMLWF(1)
NAME
xmlwf - Determines if an XML document is well-formed
SYNOPSIS
xmlwf [ -s] [ -n] [ -p] [ -x] [ -e encoding] [ -w] [ -d output-dir] [ -c] [ -m] [
-r] [ -t] [ -v] [ file ...]
DESCRIPTION
xmlwf uses the Expat library to determine if an XML document is well-formed. It is non-
validating.
If you do not specify any files on the command-line, and you have a recent version of
xmlwf, the input file will be read from standard input.
WELL-FORMED DOCUMENTS
A well-formed document must adhere to the following rules:
o The file begins with an XML declaration. For instance, <?xml version="1.0" stand-
alone="yes"?>. NOTE: xmlwf does not currently check for a valid XML declaration.
o Every start tag is either empty (<tag/>) or has a corresponding end tag.
o There is exactly one root element. This element must contain all other elements in the
document. Only comments, white space, and processing instructions may come after the
close of the root element.
o All elements nest properly.
o All attribute values are enclosed in quotes (either single or double).
If the document has a DTD, and it strictly complies with that DTD, then the document is
also considered valid. xmlwf is a non-validating parser -- it does not check the DTD.
However, it does support external entities (see the -x option).
OPTIONS
When an option includes an argument, you may specify the argument either separately ("-d
output") or concatenated with the option ("-doutput"). xmlwf supports both.
-c If the input file is well-formed and xmlwf doesn't encounter any errors, the input
file is simply copied to the output directory unchanged. This implies no names-
paces (turns off -n) and requires -d to specify an output file.
-d output-dir
Specifies a directory to contain transformed representations of the input files.
By default, -d outputs a canonical representation (described below). You can
select different output formats using -c and -m.
The output filenames will be exactly the same as the input filenames or "STDIN" if
the input is coming from standard input. Therefore, you must be careful that the
output file does not go into the same directory as the input file. Otherwise,
xmlwf will delete the input file before it generates the output file (just like
running cat < file > file in most shells).
Two structurally equivalent XML documents have a byte-for-byte identical canonical
XML representation. Note that ignorable white space is considered significant and
is treated equivalently to data. More on canonical XML can be found at
http://www.jclark.com/xml/canonxml.html .
-e encoding
Specifies the character encoding for the document, overriding any document encoding
declaration. xmlwf supports four built-in encodings: US-ASCII, UTF-8, UTF-16, and
ISO-8859-1. Also see the -w option.
-m Outputs some strange sort of XML file that completely describes the input file,
including character positions. Requires -d to specify an output file.
-n Turns on namespace processing. (describe namespaces) -c disables namespaces.
-p Tells xmlwf to process external DTDs and parameter entities.
Normally xmlwf never parses parameter entities. -p tells it to always parse them.
-p implies -x.
-r Normally xmlwf memory-maps the XML file before parsing; this can result in faster
parsing on many platforms. -r turns off memory-mapping and uses normal file IO
calls instead. Of course, memory-mapping is automatically turned off when reading
from standard input.
Use of memory-mapping can cause some platforms to report substantially higher mem-
ory usage for xmlwf, but this appears to be a matter of the operating system
reporting memory in a strange way; there is not a leak in xmlwf.
-s Prints an error if the document is not standalone. A document is standalone if it
has no external subset and no references to parameter entities.
-t Turns on timings. This tells Expat to parse the entire file, but not perform any
processing. This gives a fairly accurate idea of the raw speed of Expat itself
without client overhead. -t turns off most of the output options (-d, -m, -c,
...).
-v Prints the version of the Expat library being used, including some information on
the compile-time configuration of the library, and then exits.
-w Enables support for Windows code pages. Normally, xmlwf will throw an error if it
runs across an encoding that it is not equipped to handle itself. With -w, xmlwf
will try to use a Windows code page. See also -e.
-x Turns on parsing external entities.
Non-validating parsers are not required to resolve external entities, or even
expand entities at all. Expat always expands internal entities (?), but external
entity parsing must be enabled explicitly.
External entities are simply entities that obtain their data from outside the XML
file currently being parsed.
This is an example of an internal entity:
<!ENTITY vers '1.0.2'>
And here are some examples of external entities:
<!ENTITY header SYSTEM "header-&vers;.xml"> (parsed)
<!ENTITY logo SYSTEM "logo.png" PNG> (unparsed)
-- (Two hyphens.) Terminates the list of options. This is only needed if a filename
starts with a hyphen. For example:
xmlwf -- -myfile.xml
will run xmlwf on the file -myfile.xml.
Older versions of xmlwf do not support reading from standard input.
OUTPUT
If an input file is not well-formed, xmlwf prints a single line describing the problem to
standard output. If a file is well formed, xmlwf outputs nothing. Note that the result
code is not set.
BUGS
According to the W3C standard, an XML file without a declaration at the beginning is not
considered well-formed. However, xmlwf allows this to pass.
xmlwf returns a 0 - noerr result, even if the file is not well-formed. There is no good
way for a program to use xmlwf to quickly check a file -- it must parse xmlwf's standard
output.
The errors should go to standard error, not standard output.
There should be a way to get -d to send its output to standard output rather than forcing
the user to send it to a file.
I have no idea why anyone would want to use the -d, -c, and -m options. If someone could
explain it to me, I'd like to add this information to this manpage.
ALTERNATIVES
Here are some XML validators on the web:
http://www.hcrc.ed.ac.uk/~richard/xml-check.html
http://www.stg.brown.edu/service/xmlvalid/
http://www.scripting.com/frontier5/xml/code/xmlValidator.html
http://www.xml.com/pub/a/tools/ruwf/check.html
SEE ALSO
The Expat home page: http://www.libexpat.org/
The W3 XML specification: http://www.w3.org/TR/REC-xml
AUTHOR
This manual page was written by Scott Bronson <bronson AT rinspin.com> for the Debian
GNU/Linux system (but may be used by others). Permission is granted to copy, distribute
and/or modify this document under the terms of the GNU Free Documentation License, Version
1.1.
24 January 2003 XMLWF(1)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2024-04-24 11:56 @3.145.130.31 CrawledBy Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)