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35 lines
2.2 KiB
35 lines
2.2 KiB
15 years ago
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TODO: servicetypes
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TODO: mimetypes
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Service type inheritance (X-KDE-Derived)
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========================================
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X-KDE-Derived is for service types. ST1 derives from ST2 means ST1 is more specific than ST2.
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If a service implements ST1, it also implements ST2, but not the other way round.
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For instance, KoDocument derives from KParts/ReadWritePart, which derives from KParts/ReadOnlyPart,
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so KWord's part (which implements KoDocument) can be used as a readonly viewer for KWord files
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in Konqueror (which looks for a KParts/ReadOnlyPart).
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Mimetype "inheritance"
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======================
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We need a mechanism to also say that "text/xml is a special case of text/plain",
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or "text/docbook is a kind of text/sgml", or "application/x-smb-workgroup is a kind
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of inode/directory", etc. See below.
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Why mimetype "inheritance" doesn't use X-KDE-Derived
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====================================================
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The confusing thing is that we said "a mimetype is a servicetype". But that's not exactly correct.
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As Waldo noted, "the ability to open a mimetype" is what's a servicetype.
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So if text/xml said X-KDE-Derived=text/plain (i.e. ST1=text/xml, ST2=text/plain),
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then an application opening text/xml (ST1) could also open text/plain (ST2) - which is not necessarily true.
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We want the other way round: to be able to open special kinds of text/plain in a plain text editor.
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This is what X-KDE-IsAlso was introduced for. X-KDE-IsAlso kind of "works the other way" than X-KDE-Derived.
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If M1 is a special kind of M2 (mimetypes), then "the ability to open M2" derives from "the ability to open M1"
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So we say in text/xml: X-KDE-IsAlso=text/plain, and applications that can open text/plain can also open text/xml.
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Pattern Accuracy
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======================
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In some cases of inheritance several mimetypes shares the same extension (with the primary case being Ogg Multimedia files).
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This has been solved sofar by matching the extension to most generic mimetype. To indicate that the mimetype can be refined further, the flag X-KDE-PatternsAccuracy can be set. The value to X-KDE-PatternsAccuracy is a number between 0-100, with 100 being the default if not set. Any values below 100 is interpreted as the possibility of further mimetype refinement.
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