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xmllint is a command line XML tool that can perform XML validation. It can be found in UNIX / Linux environments. XML toolkit. The XML C parser and toolkit of Gnome – libxml includes xmllint; XML Validator Online Validate your XML data. XML Schema Validator Validate XML files against an XML Schema.
Although W3C XML Schema's ability to add default attributes to elements is an advantage, it is a disadvantage in some ways as well. It means that an XML file may not be usable in the absence of its schema, even if the document would validate against that schema.
When an instance document is validated against a schema (a process known as assessment), the schema to be used for validation can either be supplied as a parameter to the validation engine, or it can be referenced directly from the instance document using two special attributes, xsi:schemaLocation and xsi:noNamespaceSchemaLocation.
Liquid XML Studio provides features for editing and validating XML documents. The GUI is a multi-document tabbed design and each document can be viewed in a text, graphical or split view. Document validation includes both checking for well formedness against the W3C XML standard and also checking validity against associated W3C XML Schema.
XMLStarlet is a set of command line utilities (toolkit) to query, transform, validate, and edit XML documents and files using a simple set of shell commands in a way similar to how it is done with UNIX grep, sed, awk, diff, patch, join, etc commands.
The problems users face when working with the XSD standard can be mitigated with the use of graphical editing tools. Although any text-based editor can be used to edit an XML Schema, a graphical editor offers advantages; allowing the structure of the document to be viewed graphically and edited with validation support, entry helpers and other useful features.
Oxygen XML offers several features for editing XML documents. Documents can be checked in proper XML form. They can also be validated against a schema. For validation purposes, the documents can be validated against DTD, W3C XML Schema, RELAX NG, Schematron, NRL and NVDL schemas. The editor can also validate the XML as it is entered.
XML schemas specify which XML elements are valid, in what order these elements should appear in XML data, which XML data types are associated with each element, and so on. pureXML allows you to validate the cells in a column of XML data against no schema, one schema, or multiple schemas. pureXML also provides tools to support evolving XML schemas.