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    <p>I'm convinced that documentation for <code>NSPasteboard</code>'s <code>-types</code> is actually faulty. The correct documentation should be something like:</p> <blockquote> <p>An array of <code>NSString</code> objects containing the union of the types of data declared for all the pasteboard items on the receiver, <em>with the addition of old-style, non-UTI type identifiers.</em></p> </blockquote> <p>If you're targeting OS X 10.6+, you should be able to completely disregard <code>NSPasteboard</code>'s <code>-types</code> and focus only on each <code>NSPasteboardItem</code>'s <code>-types</code>, but this requires working exclusively with UTIs.</p> <p>To convert a non-UTI type identifier to a UTI you need to use the <code>UTTypeCreatePreferredIdentifierForTag()</code> function; you also need to know what kind of identifier you already have (<code>kUTTagClassFilenameExtension</code>, <code>kUTTagClassMIMEType</code>, <code>kUTTagClassNSPboardType</code> or <code>kUTTagClassOSType</code>). This type is the first argument to the function. The second is the identifier itself (as a <code>CFStringRef</code>). While the documentation suggests that it's OK to pass <code>NULL</code> for the third argument, it seems to be important to actually pass <code>kUTTypeData</code> when generating these dynamic UTIs.</p> <p>For example, to get the (dynamic) UTI for data with the old-style identifier "WebURLsWithTitlesPboardType":</p> <pre><code>CFStringRef webURLsWithTitlesUTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassNSPboardType, CFSTR("WebURLsWithTitlesPboardType"), kUTTypeData); </code></pre>
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    1. POWhy doesn't NSPasteboard's -types return the union of the contained NSPasteboardItem's -types?
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