Thank you all for your suggestions. Indeed, both codemirror ( http://codemirror.net/mode/xml/ ) and ace ( https://ace.c9.io/#nav=about ) look like excellent candidates. Mark Mark V. Sullivan Application Architect Sobek Digital Hosting and Consulting, LLC [log in to unmask]<mailto:[log in to unmask]> 866-981-5016 (office) ________________________________ From: Sebastian Karcher <[log in to unmask]> Sent: Thursday, September 29, 2016 11:11 PM To: Code for Libraries; Mark V. Sullivan Subject: Re: Online XML editing library (JQuery?) Hi Mark, we're also using codemirror, mentioned by Vincent, for the XML editor built into the Citation Style Language visual editor: http://editor.citationstyles.org/codeEditor/ I didn't build this, so can't speak to the difficulty of implementation, but it's certainly been stable and easy to maintain. Best, Sebastian