|@is_a@|string|Arvados object type|@["head_uuid","is_a","arvados#collection"]@|
|@exists@|string|Test if a subproperty is present.|@["properties","exists","my_subproperty"]@|
-Note:
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h4(#substringsearchfilter). Filtering using substring search
Resources can also be filtered by searching for a substring in attributes of type @string@, @array of strings@, @text@, and @hash@, which are indexed in the database specifically for search. To use substring search, the filter must: