This section describes internal technical details of collations, including the file format of collation files.
This section is of particular use if you want to create a database using a custom collation. For information on the steps involved, see “Creating a custom collation” and “Creating a database with a custom collation”.
You can create a database using a collation different from the supplied collations. This section describes how to build databases using such a custom collation.
In building multibyte custom collations, you can specify which ranges of values for the first byte signify single- and double-byte (or more) characters, and which specify space, alpha, and digit characters. However, all first bytes of value less than \x40 must be single-byte characters, and no follow bytes may have values less than \x40. This restriction is satisfied by all supported encodings.
Collation files may include the following elements:
Comment lines, which are ignored by the database.
A title line.
A Collation section.
An Encodings section.
A Properties section.
