XML Schema XSD validation tool

Question

At the office we are currently writing an application that will generate XML files against a schema that we were given   We have the schema in an  XSD file   Are there tool or libraries that we can use for automated testing to check that the generated XML matches the schema   We would prefer free tools that are appropriate for commercial use although we won t be bundling the schema checker so it only needs to be usable by devs during development   Our development language is C   if that makes any difference  although I don t think it should as we could generate the xml file and then do validation by calling a separate program in the test

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For Windows there is the free XML Notepad 2007   You can select XSD s for it to validate against  UPDATE  better yet  use Notepad   with the XML Tools plugin

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http   www xmlvalidation com    Be sure to check the   Validate against external XML schema  Box

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An XML editor for quick and easy XML validation is available at http   www xml-buddy com  You just need to run the installer and after that you can validate your XML files with an easy to use desktop application or the command-line  In addition you also get support for Schematron and RelaxNG  Batch validation is also supported     Update 1 13 2012  The command line tool is free to use and uses Xerces as XML parser

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I m just learning Schema  I m using RELAX NG and using xmllint to validate  I m getting frustrated by the errors coming out of xmlllint  I wish they were a little more informative   If there is a wrong attribute in the XML then xmllint tells you the name of the unsupported attribute  But if you are missing an attribute in the XML you just get a message saying the element can not be validated    I m working on some very complicated XML with very complicated rules  and I m new to this so tracking down which attribute is missing is taking a long time    Update  I just found a java tool I m liking a lot  It can be run from the command line like xmllint and it supports RELAX NG  https   msv dev java net

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You can connect your XML schema to Microsoft Visual Studio s Intellisense   This option gives you both real-time validation AND autocomplete  which is just awesome   I have this exact scenario running on my free copy of Microsoft Visual C   2010 Express

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I tend to use xsd from Microsoft to help generate the xsd from a  NET file  I also parse out sections of the xml using xmlstarlet   The final free tool that would be of use to you is altovaxml  which is available at this URL  http   www altova com download components html    This allows me to scan all the xml files picking up which xsd to use by parsing the xml     Function       verifyschemas - Will validate all xml files in a configuration directory against the schemas in the passed in directory   Parameters       The directory where the schema   xsd files are located   Must be using dos pathing like  VerifySchemas  c   XMLSchemas      Requirements       Must be in the directory where the configuration files are located   verifyschemas         for FILENAME in   find   -name    xml  -print0   xargs -0      do         local SchemaFile  1  getconfignamefromxml  FILENAME  xsd         altovaxml  validate  FILENAME  schema  SchemaFile  gt    temp txt 2 gt   dev null         if      -ne 0    then             printf  Failed to verify                cat   temp txt   tail -1   tr -d   r              printf      -  FILENAME with  SchemaFile n          fi     done     To generate the xml I use     xsd DOTNET dll  type CFGCLASS  amp  rename schema0 xsd CFGCLASS xsd  To get the xsd name I use      xmlstarlet sel -t -m  XXX   -v local-name    1   sed  s        This allows me to pickup the correct XSD using an element tag within the xml file   The net result is that I can call a bash function to scan all the XML files and verify them  Even if they are in multiple subdirectories

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one great visual tool to validate and generate XSD from XML is IntelliJ IDEA  intuitive and simple

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I found this online validator from  corefiling  quite useful - http   www corefiling com opensource schemaValidate html  After trying few tools to validate my xsd  this is the one which gave me detailed error info - so I was able to fix the error in schema

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xmlstarlet is a command-line tool which will do this and more      xmlstarlet val --help XMLStarlet Toolkit  Validate XML document s  Usage  xmlstarlet val  lt options gt     lt xml-file-or-uri gt        where  lt options gt    -w or --well-formed        - validate well-formedness only  default    -d or --dtd  lt dtd-file gt      - validate against DTD   -s or --xsd  lt xsd-file gt      - validate against XSD schema   -E or --embed              - validate using embedded DTD   -r or --relaxng  lt rng-file gt  - validate against Relax-NG schema   -e or --err                - print verbose error messages on stderr   -b or --list-bad           - list only files which do not validate   -g or --list-good          - list only files which validate   -q or --quiet              - do not list files  return result code only   NOTE  XML Schemas are not fully supported yet due to its incomplete       support in libxml2  see http   xmlsoft org   XMLStarlet is a command line toolkit to query edit check transform XML documents  for more information see http   xmlstar sourceforge net     Usage in your case would be along the lines of   xmlstarlet val --xsd your schema xsd your file xml

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I use Xerces   http   xerces apache org xerces-c

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Another online XML Schema  XSD  validator  http   www utilities-online info xsdvalidation

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There s a plugin for Notepad   called XML Tools that offers XML verification and validation against an XSD   You can see how to use it here

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http   www xmlvalidation com    Be sure to check the   Validate against external XML schema  Box

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After some research  I think the best answer is Xerces  as it implements all of XSD  is cross-platform and widely used  I ve created a small Java project on github to validate from the command line using the default JRE parser  which is normally Xerces  This can be used on Windows Mac Linux    There is also a C   version of Xerces available if you d rather use that   The StdInParse utility can be used to call it from the command line  Also  a commenter below points to this more complete wrapper utility   You could also use xmllint  which is part of libxml  You may well already have it installed  Example usage   xmllint --noout --schema XSD FILE XML FILE   One problem is that libxml doesn t implement all of the specification  so you may run into issues     Alternatively  if you are on Windows  you can use msxml  but you will need some sort of wrapper to call it  such as the GUI one described in this DDJ article  However  it seems most people on Windows use an XML Editor  such as Notepad    as described in Nate s answer  or XML Notepad 2007 as suggested by SteveC  there are also several commercial editors which I won t mention here    Finally  you ll find different programs will  unfortunately  give different results  This is largely due to the complexity of the XSD spec  You may want to test your schema with several tools   UPDATE  I ve expanded on this in a blog post

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The online XML Schema Validator from DecisionSoft allows you to check an XML file against a given schema

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