XMLmind
XMLmind XML Editor is a strictly validating, near WYSIWYG, XML editor. It supports  DocBook, Darwin Information Typing Architecture (DITA), MathML and XHTML. The XXE Standard edition is available free for personal use. There is also a comparatively low-cost Professional Edition. XMLmind is recommended for working with the O'Reilly Atlas publishing platform. See also
 XML editor

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XML editors