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https://issues.apache.org/jira/browse/DERBY-4627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13746790#comment-13746790
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Kim Haase commented on DERBY-4627:
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That is a good idea, to make it a separate topic. 

In fact I am wondering if it might make sense to spin off the section "Creating 
a case-insensitive database" from 
http://db.apache.org/derby/docs/10.10/devguide/tdevdvlpcollation.html into a 
separate topic also -- so that it too shows up in the TOC. 
                
> Document how to install your own custom collation for use in sorting and 
> comparing string data values.
> ------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4627
>                 URL: https://issues.apache.org/jira/browse/DERBY-4627
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 10.6.1.0
>            Reporter: Rick Hillegas
>            Assignee: Kim Haase
>
> The Developer's Guide suggests that you are limited to the collations shipped 
> with the JRE. Consider, for instance, this sentence in the section titled 
> "Character-based collation in Derby":
> "Derby currently supports only running those rules that can be loaded 
> dynamically from the running JVM based on the territory attribute. Overrides 
> to these rules by the user are not supported."
> This is misleading. A long time ago, Knut wrote a blog explaining how to 
> write your own custom collation, plug it into the JRE, and then use it on 
> string data stored in Derby: 
> http://blogs.sun.com/kah/entry/user_defined_collation_in_apache
> This is a very useful capability of Derby. We should document it.

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