Concepts

Proxy Item

• SCM bundle
• Generic build action etc. (work in progress)

Semantic Class

• Import/export commands, e.g. Binary Property List
• Will/did save callbacks, e.g. Make Script Executable

Encoding

• Byte order mark / endian: UTF-8, UTF-16, UTF-32.
• .tm_properties: attr.file.unknown-encoding.
• Extended attributes: com.apple.Encoding.
• Line endings

TextMate will do a few tests against your file:

1. Does it have an UTF-8/16/32 BE/LE BOM?
   Do not take this to mean that UTF-8 BOMs are fine!
2. Does it have a com.apple.TextEncoding extended attribute?
3. Does it have an encoding setting via .tm_properties?
4. Is it valid ASCII/UTF-8?

If all of these tests fail, it will ask you to pick the proper encoding.