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XMLmind XML Editor for Linux allows to edit large, complex, modular, XML documents. It makes it easy mastering XML vocabularies such as DITA or DocBook.

The intended users of XMLmind XML Editor are not particularly the programmers but rather the technical writers.

Validating XML editor. Supports DTD, W3C XML Schema, RELAX NG, Schematron schemas.

Schema-directed editing. This makes creating invalid documents almost impossible.
Automatically switches to lenient mode to make it easy fixing an invalid element. Automatically switches back to its strict, validating, normal editing mode, once the element is fixed.
Can be used to edit XML documents not constrained by a grammar. In such case, XMLmind XML Editor (XXE) is still very nice to use because it simulates a very loose, dynamically created/dynamically updated, DTD.
Supports XML catalogs, the processing-instruction, the processing-instruction.

Ready-to-use support for the following document types:

XHTML 1.0, 1.1, 5.0. Fully supports HTML tables. Can dynamically apply to the styled view all the CSS styles found in style attributes, style elements and link elements pointing to CSS stylesheets.
DocBook v4 (DTD), v5 (RELAX NG schema). Fully supports CALS and HTML tables (this means: proper rendering and easy editing using specialized table editing commands).
DITA v1.0, v1.1, v1.2. Fully supports CALS tables and simpletables.
MathML 2 Presentation Markup. Comes with a Math tool which makes it easy adding equations to your XML documents without having to learn MathML.
Simplified DocBook [A]. DocBook Slides [A].

The word processor-like view is parametrized using a substantial subset of CSS2.

Also has a fully editable tree view.
Multiple, synchronized, views can be used to edit the same document, for example: a tree view showing XML nodes, a word processor-like view and another styled view only showing section titles.
Supports the @media print standard CSS construct.
Proprietary extensions to CSS allow styled blocks and tables to be collapsed/expanded.
Proprietary extensions to CSS allow controls such as buttons, check boxes, combo boxes, text fields, etc, to be embedded in the styled view. With this feature, XXE can be used to edit XML data, XML documents or a mix of both content types.
Proprietary extensions to CSS allow to style attributes, comments and processing instructions.
More info in XMLmind XML Editor - Support of Cascading Style Sheets (W3C CSS).

Can be used to author modular documents, even very fine grained ones.

Creating a modular document is easy and safe: simply copy a reference to an element from one place (Ctrl+Shift-C) and paste it elsewhere (Ctrl-V = Paste Into, Ctrl-U = Paste Before or Ctrl-W = Paste After). More info in the tutorial.
Fully supports DITA conref.
For document types other than DITA, modular documents are implemented using XIncludes.

Supports many image formats (GIF, JPEG, PNG, SVG, TIFF, BMP, EPS, PDF, etc) through the use of image toolkit plug-ins.

Supports graphics embedded in the XML document (SVG elements and images encoded in base64Binary) as well as references to external image files.
Has an advanced image viewport component which allows to render images on screen in a WYSIWYG fashion (this needs to be specified in the CSS style sheet).