Tamino XQuery User Guide - Software AG Documentation

Text Retrieval
The function tf:containsAdjacentText returns true if the tokens "one" and "more" are found in
that order within a distance of less than nine tokens. Since there are eight unmatched tokens, the
function returns true for the above query. Let us slightly change the query expression:
let $text := text{"One, Two, Three, Four, Can I have a little more?"}
return tf:containsAdjacentText($text, 9, "one", "four", "more")
The function returns true if all the tokens "one", "four" and "more" are found in that order within
a distance of less than nine tokens, not including any matched tokens in between such as "four".
Since there are seven unmatched tokens, the function returns true for the above query.
Generally, if you use a distance value of "1", it means that the tokens follow immediately one after
another. It follows that tf:containsAdjacentText($mynode, 1, "search", "text") is equivalent
to tf:containsText($mynode, "search text").
While tf:containsAdjacentText respects the word order, the function tf:containsNearText
does not. The following query using tf:containsNearText returns true, using
tf:containsAdjacentText it would return false:
let $text := text{"One, Two, Three, Four, Can I have a little more?"}
return tf:containsNearText($text, 2, "four", "one", "two")
Highlighting Retrieval Results
When retrieving information from some text corpus, it is desirable to visualize the information
found. In Tamino XQuery, you can do so by “highlighting” retrieval results. Consider the following
query from the Tamino XQuery reference guide which searches in all review nodes for the word
"discussion":
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XQuery User Guide