XFA Specification
Chapter 17, Locale Set Specification
722
The meridiem element
An element to describe the name of one of the aspects of the meridiem.
<meridiem>
...pcdata...
</meridiem>
Content
The data-content is interpreted as the name of the aspect of the meridiem. Specifically, the first occurrence
of this element specifies the name of the ante-meridiem (AM).The second and last occurrence of this
element specifies the name of the post-meridiem (PM).