Different perspectives: XML source editor, XSLT debugger, XQuery debugger, tree viewer/editor.

Schema annotations/DTD comments presented next to the content completion proposals.

Edit and validate support for XML Schema (visual diagram), Relax NG (visual diagram), NRL, DTD, Schematron.

XPath 1.0 and XPath 2.0 evaluator and XPath content completion support.

XML Diff and Merge.

XSLT 1.0 and XSLT 2.0 editing, validation, transformation, debugging and profiling support.

Can be used as standalone desktop application, run through Java Web Start or as an Eclipse plugin.

Multiple validation engines: Xerces, XSV, LIBXML, MSXML 4.0, MSXML.NET, Saxon SA, SQC.

Powerful XSLT search and refactoring actions working across multiple files.

Conversions from DTD, Relax NG or a set of documents to XML Schema, DTD or Relax NG.

Validate XML documents with XML Schemas, Relax NG, DTD, NRL and Schematron schema or embedded Schematron rules.

The best content completion support offering elements, attributes, values (handling ID references, enumerations, union and list values).

Batch validation and batch transformations.

Context sensitive content assistant driven by XML Schema, Relax NG, DTD or by the document structure.

Multiple XSLT processors: Xalan 2.7.0, Saxon 6.5.5, Saxon 8, XSLTProc, MSXML3.0/4.0/.NET 1.0/2.0.

Code templates (abbreviations).

Generate HTML documentation from XML Schemas.

XQuery 1.0 editing, validation, transformation debugging and profiling support.

XSLT debugging using multiple processors: Xalan 2.7.0, Saxon 6.5.5, Saxon 8 Basic and Schema Aware.

Mapping from the XSLT or XQuery output result to the source and stylesheet or XQuery file locations.

Tree based Outliner synchronized in real time with the edited document.

Preview the transformation results as XHTML, XML or in your browser.

FO transformations using embedded Apache's FOP to generate PDF or PS documents.

New XML document wizards to easily create documents specifying a schema or a DTD.

Easy transformation management with reusable scenarios.

Import from relational databases and other sources to XML.

Source folding support with powerful manipulation actions and persistence.

Schema Model View presenting schema information about the current element.

Canonicalization and digital signature of documents.

Support for external Formatting Object Processors.

XInclude support.

Format and indent of XML files.

Easy error tracking - locate the error source by clicking on it, visual markers and overview ruler.

Link to the exact location in the specification for XML Schema errors.

Support for editing remote files over FTP, HTTP/WebDAV and HTTPS/WebDAV.

No platform lock-in, the same license can be used on any platform with any distribution.

Unicode and multi-language support: English, German, French, Italian and Japanese.

Find and replace support allows regular expressions, is XML aware and can handle multiple files.

Spell-checking.

XML Catalog support.

Includes the DocBook and TEI documentation frameworks.

Fully-fledged client for the Subversion (SVN) versioning system.

Support for generating large sets of sample XML instances from XML Schema.