Follow-up to image map discussion

I ran some tests with the following image map markup, Oxygen, and DITA-OT: Shape = default, no content for <coords>; result: The entire image is the linked region.
<imagemap id = "pie-chart" > <image href = "Pie_Chart_Example.png" id = "pie_chart" > <alt> Pie Chart Example </alt> </image> <area> <shape> default </shape> <coords/> <xref href = "https://wiki.oasis-open.org/dita/FrontPage" format = "html” scope = "external" /> </area> </imagemap> Shape = default, <coords> contains content; result: The entire image is the linked region. But Oxygen generated a Schematron message that “The default shape means the entire diagram, so we should have no coordinates.” <imagemap id = "pie-chart" > <image href = "Pie_Chart_Example.png" id = "pie_chart" > <alt> Pie Chart Example </alt> </image> <area> <shape> default </shape> <coords> 5, 9, 70, 9 </coords> <xref href = "https://wiki.oasis-open.org/dita/FrontPage" format = "html" scope = "external" /> </area> </imagemap> Best, Kris Kristen James Eberlein Chair, OASIS DITA Technical Committee Owner, Eberlein Consulting LLC 
Skype: kriseberlein; voice: +1 (919) 622-1501