Options include:

"ascending"

Ranges should be returned in ascending order.

"descending"

Ranges should be returned in descending order.

"empties"

Include fully-bounded ranges whose frequency is 0. These ranges will have no minimum or maximum value. Only empty ranges that have both their upper and lower bounds specified in the $bounds options are returned; any empty ranges that are less than the first bound or greater than the last bound are not returned. For example, if you specify 4 bounds and there are no results for any of the bounds, 3 elements are returned (not 5 elements).

"any"

Values from any fragment should be included.

"document"

Values from document fragments should be included.

"properties"

Values from properties fragments should be included.

"locks"

Values from locks fragments should be included.

"frequency-order"

Ranges should be returned ordered by frequency.

"item-order"

Ranges should be returned ordered by item.

"fragment-frequency"

Frequency should be the number of fragments with an included value. This option is used with cts:frequency.

"item-frequency"

Frequency should be the number of occurences of an included value. This option is used with cts:frequency.

"timezone=TZ"

Return timezone sensitive values (dateTime, time, date, gYearMonth, gYear, gMonth, and gDay) adjusted to the timezone specified by TZ. Example timezones: Z, -08:00, +01:00.

"limit=N"

Return no more than N ranges.

"skip=N"

Skip over fragments selected by the cts:query to treat the Nth fragment as the first fragment. Values from skipped fragments are not included. This option affects the number of fragments selected by the cts:query to calculate frequencies. Only applies when a $query parameter is specified.

"sample=N"

Return only ranges for buckets with at least one value from the first N fragments after skip selected by the cts:query. This option does not affect the number of fragments selected by the cts:query to calculate frequencies. Only applies when a $query parameter is specified.

"truncate=N"

Include only values from the first N fragments after skip selected by the cts:query. This option also affects the number of fragments selected by the cts:query to calculate frequencies. Only applies when a $query parameter is specified.

"score-logtfidf"

Compute scores using the logtfidf method.

"score-logtf"

Compute scores using the logtf method.

"score-simple"

Compute scores using the simple method.

"score-random"

Compute scores using the random method.

"score-zero"

Compute all scores as zero.

"checked"

Word positions should be checked when resolving the query.

"unchecked"

Word positions should not be checked when resolving the query.

"too-many-positions-error"

If too much memory is needed to perform positions calculations to check whether a document matches a query, return an XDMP-TOOMANYPOSITIONS error, instead of accepting the document as a match.

"eager"

Perform most of the work concurrently before returning the first item from the indexes, and only some of the work sequentially while iterating through the rest of the items. This usually takes the shortest time for a complete item-order result or for any frequency-order result.

"lazy"

Perform only some the work concurrently before returning the first item from the indexes, and most of the work sequentially while iterating through the rest of the items. This usually takes the shortest time for a small item-order partial result.

"concurrent"

Perform the work concurrently in another thread. This is a hint to the query optimizer to help parallelize the lexicon work, allowing the calling query to continue performing other work while the lexicon processing occurs. This is especially useful in cases where multiple lexicon calls occur in the same query (for example, resolving many facets in a single query).