included in <oXygen/> (Windows edition), associated to XML Editor, able to validate the edited document against XML Schema, Relax NG schema full syntax, internal DTD (included in the XML document) or a custom schema type. XML catalogs support(--catalogs) and XInclude processing(--xinclude) are enabled by default in the preconfigured LIBXML validator. The --postvalid flag is set as default allowing LIBXML to validate correctly the main document even if the XInclude fragments contain IDREFS to ID's located in other fragments.

For validation against an external DTD specified by URI in the XML document the parameter --dtdvalid ${ds} must be added manually to the DTD validation command line. ${ds} represents the detected DTD declaration in the XML document.

	Note
	On Mac OS X if the full path to the LIBXML executable file is not specified in the Executable path text field some errors may occur on validation against a W3C XML Schema like: Unimplemented block at ... xmlschema.c These errors can be avoided by specifying the full path to the LIBXML executable file.

not included in <oXygen/>, the jar file and license key file of Saxon 9 SA must be placed in the lib subdirectory of the installation directory and the entry <library name="lib/saxon9sa.jar"/> must be copied to the <runtime> section of the [Eclipse-install-folder]/plugins/com.oxygenxml.editor_9.3.0/plugin.xml file. After that Eclipse must be restarted with the -clean parameter. It is associated to XML Editor and XSD Editor.

included in <oXygen/> (Windows edition). It is associated to XML Editor, XSD Editor and XSL Editor. It is able to validate the edited document against XML Schema, internal DTD (included in the XML document), external DTD or a custom schema type.

included in <oXygen/> (Windows edition). It is associated to XML Editor, XSD Editor and XSL Editor. It is able to validate the edited document against XML Schema, internal DTD (included in the XML document), external DTD or a custom schema type.

not included in <oXygen/>. A Windows distribution of XSV can be downloaded from: ftp://ftp.cogsci.ed.ac.uk/pub/XSV/XSV210.EXE A Linux distribution can be downloaded from ftp://ftp.cogsci.ed.ac.uk/pub/XSV/XSV-2.10-1.noarch.rpm. The executable path is configured already in <oXygen/> for the installation directory [oXygen-install-dir]/xsv. If it is installed in a different directory the predefined executable path must be corrected in Preferences. It is associated to XML Editor and XSD Editor. It is able to validate the edited document against XML Schema or a custom schema type.

not included in <oXygen/>. It can be downloaded from here (it comes as a .zip file, at the time of this writing SQC2.2.1.zip is about 3 megabytes). The executable path and working directory are configured already for the SQC installation directory [oXygen-install-dir]/sqc. If it is installed in a different directory the predefined executable path and working directory must be corrected in Preferences. It is associated to XSD Editor.

not included in <oXygen/>. Before you can use this validator you must install the Intel® XML Software Suite and configure it in the <oXygen/> preferences. It is associated to XML Editor and XSD Editor.