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Some commonly used types are missing:

• Template versions of Microsoft Office documents (both binary and xml flavors)
• Powerpoint slideshows (both binary and xml flavors)
• CSS files
• Windows Media containers (wma, wmv)

If a file suffix is not all lowercase, UtiBuilder does not recognize it. The following unit test will fail:

String fileSuffix = "DOCX";
UtiBuilder instance = new UtiBuilder();
Uti expResult = new Uti("com.microsoft.word.docx");
Uti result = instance.fromSuffix(fileSuffix);
assertEquals(expResult, result);

Add a method to the public API so that conformance relations can be checked.

Add a way to map a UTI to a file extension. When multiple file extensions map to the same UTI, mark one of them as "preferred" in the XML definitions.

For any Uti object returned by UtiBuilder, calling Uti#toString followed by UtiBuilder#fromString should return a Uti object equal to the original. This is not the case for a dyn.* Uti, as evidenced by this failing test:

String unknownSuffix = "foobar";
UtiBuilder instance = new UtiBuilder();
Uti orig = instance.fromSuffix(unknownSuffix);
Uti copy = instance.fromString(orig.toString());

copy will be null.