You can create a checkbox "space category = x" within the Advanced Search Macro . This could be used to filter search results for languages, for example. To do so, proceed as follows:
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Edit the page containing the Advanced Search macro.
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Within the Adv. Search macro, insert a Search Checkbox Macro .
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Switch the radio button to "advanced" and insert this string: space.category = x
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In the field "Label of the checkbox", insert "space category x" (or something similar).
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Decide if the checkbox should be checked per default.
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Save the macro.
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Copy the new checkbox macro and paste it into the existing Adv. Search macros if needed.