<mapping>

<mapping> (character mapping) contains one or more characters which are related to the parent character or glyph in some respect, as specified by the type attribute.
Module gaiji — 5 Representation of Non-standard Characters and Glyphs
In addition to global attributes att.typed (@type, @subtype)
Used by
char glyph
May contain
gaiji: g
Declaration 

<rng:element name="mapping">
 <rng:ref name="att.global.attributes"/>
 <rng:ref name="att.typed.attributes"/>
 <rng:ref name="macro.xtext"/>
</rng:element>
element mapping { att.global.attributes, att.typed.attributes, macro.xtext }
Example
<mapping type="modern">r</mapping>
<mapping type="standard">人</mapping>
Note
Suggested values for the type attribute include exact for exact equivalences, uppercase for uppercase equivalences, lowercase for lowercase equivalences, and simplified for simplified characters. The g elements contained by this element can point to either another char or glyphelement or contain a character that is intended to be the target of this mapping.