Parse the UCD XML format - the Unicode Character Database in XML format. Do not
change the ICU binary data file formats, at least not just because of the change
of the input format.
Use the toolutil XML parser, use property [value] aliases for property and value
parsing, gather the preparation and generator code from each of the ICU UCD
parser/generator tools (genprops, gennorm, etc.) and merge them.
Property [value] aliases may need to be parsed the old way so that they are
available with correct enum values during runtime of the UCD XML parser.
Advantage: A single XML file provides all property data. In the old format,
multiple files sometimes need to be read for a single property. (For example,
for numeric values.)
Timing: Before the UCD XML format is ready for production use, there need to be
tools verifying that the XML files reflect the UCD data precisely.
