Hex
or Decimal Entity Refs
When
using character references, you have the option of specifying the character
using a decimal or hexadecimal number. Recall that you can embed a character
reference in XML using a & character, followed by a number, and terminated with
a ;. If the reference begins with , the digits provide a hexadecimal representation
of the character's code. If it begins just with , the digits provide a decimal
representation of the character's code.