The syntax is fairly simple. Multiple query terms can be combined with the keywords AND or OR, terms can be excluded by prefixing them with a minus, and specific properties can be searched by combining the property name with a comparator and the value.
Tip
This syntax can also be used in standard search fields such as the Dolphin one.
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Nepomuk KDEorNepomuk AND KDE search for everything containing the words "Nepomuk" and "KDE" in any of their properties (this includes the content of files).
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Nepomuk OR KDE search for everything containing either the word "Nepomuk" or the word "KDE" in any of their properties.
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"Nepomuk KDE" search for everything containing the exact phrase "Nepomuk KDE" in any of their properties.
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hastag:Nepomuk search for everything that is tagged with a tag named "Nepomuk".
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+hastag:nepomuk AND -hastag:scribo search for everything that has a tag labeled "nepomuk" but not a tag labeled "scribo".