*When ''values'' are variable/non-standard eg job titles vs movie titles (which means one searches on attributes, not attribute '''values''')
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*When attribute ''values'' are variable/non-standard e.g. job titles vs movie titles, which means one searches on attributes themselves, not attribute ''values''. In other words, [[Centiare:Tutorial#Use_uniform_titles_when_identifying_any_Key_Person|job titles]] may vary between different key people, such as president, vice-president, director, etc., whereas there is only one (the original) "Gone With the Wind".
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*When attributes have relations to other attributes eg key person<->job title.
*When attributes have relations to other attributes eg key person<->job title.