Looking at various template XML files, I sometimes see something like this:
t-field-options='{"widget": "contact", "fields": ["address"], "no_marker": true}'
However, I can't find any detailed documentation for various options that are available for such a statement. There's lots of stuff on "widgets", but it's all about writing Python code to create your own thingamajig. Is there any documentation for the XML formatting widgets?
@Jeff, I'm also interested in this. I've purchased the theme developer handbook from Odoo's indiegogo campaign here: https://www.indiegogo.com/projects/bootstrap-themes-for-odoo-cms although the book is not likely to be released until the campaign finishes I believe it does cover the subject as it applies to the CMS/E-commerce and theme modules. Once I have read the book I will write back here with information on what I have learnt, however in the meantime if you find any resources covering widget creation and customisation I would be interested to know what you have found.