RenderX have recently released several XSLT stylesheets that produce SVG representations of several barcode formats. The stylesheets are heavily parameterized to control bars width/height, wide-to-narrow ratio, quiet zone size, font properties for human readable label, etc.
Syntext has released Serna 1.2, a $299 payware XSL-based WYSIWYG XML Document Editor for Windows and Linux. Features include on-the-fly XSL-driven XML rendering and transformation, on-the-fly XML Schema validation, and spell checking. New features in this release include support for XHTML and GCA proceedings.