I think Goldilocks is a good example here. You have to be like her.
Look over the open source tools at http://www.w3.org/
Best inexpensive Html/Xml/Xslt_Editor?
I am looking for an Html/Xml/Xslt_Editor,
which shows simultaneously and dynamically:
1) an html source view
2) an xml source view
3) an xslt source view
4) a Browser view