XFA Specification
Chapter 17, Locale Set Specification
718
The era element
An element to describe the name of one of the eras of the calendar.
<era>
...pcdata...
</era>
Content
The data-content is interpreted as the name of the era. Specifically, the first occurrence of this element
specifies the name of the first era of the calendar (BC).The second and last occurrence of this element
specifies the name of the second era of the calendar (AD).