Is ICU a private framework on iOS?

Question

Is ICU considered to be a private framework in Apple terms? It's not very clear to me whether the header files in $SDK/usr/include/ are private or not. I'd like to use functions like u_strcasecmp from <unicode/ustring.h>.

The header files are present so I make an assumption that it's not really private. On the other hand I cannot find Apple documenting any ICU functions in their API reference.

Answer 1

No. It should not be a private framework. Apples stand on this may have changed since the time this question was posted.

The Text Programming Guide for iOS explicitly mentions the availability of a modified ICU 4.2.1 version and the contained ustring.h header.