cts:query matching fields by name with a
range-index entry equal to a given value. Searches with the
cts:field-range-query
constructor require a field range index on the specified field name(s);
if there is no range index configured, then an exception is thrown.
Operators include:
- "<"
- Match range index values less than $value.
- "<="
- Match range index values less than or equal to $value.
- ">"
- Match range index values greater than $value.
- ">="
- Match range index values greater than or equal to $value.
- "="
- Match range index values equal to $value.
- "!="
- Match range index values not equal to $value.
Options include:
- "collation=URI"
- Use the range index with the collation specified by URI. If not specified, then the default collation from the query is used. If a range index with the specified collation does not exist, an error is thrown.
- "cached"
- Cache the results of this query in the list cache.
- "uncached"
- Do not cache the results of this query in the list cache.
- "min-occurs=number"
- Specifies the minimum number of occurrences required. If fewer that this number of words occur, the fragment does not match. The default is 1.
- "max-occurs=number"
- Specifies the maximum number of occurrences required. If more than this number of words occur, the fragment does not match. The default is unbounded.
- "score-function=function"
- Use the selected scoring function. The score function may be:
- linear
- Use a linear function of the difference between the specified query value and the matching value in the index to calculate a score for this range query.
- reciprocal
- Use a reciprocal function of the difference between the specified query value and the matching value in the index to calculate a score for this range query.
- zero
- This range query does not contribute to the score. This is the default.
- "slope-factor=number"
- Apply the given number as a scaling factor to the slope of the scoring function. The default is 1.0.
- "synonym"
- Specifies that all of the terms in the $value parameter are considered synonyms for scoring purposes. The result is that occurrences of more than one of the synonyms are scored as if there are more occurrences of the same term (as opposed to having a separate term that contributes to score).
If you want to constrain on a range of values, you can combine multiple
cts:field-range-query constructors together
with cts:and-query or any of the other composable
cts:query constructors.
If neither "cached" nor "uncached" is present, it specifies "cached".
Negative "min-occurs" or "max-occurs" values will be treated as 0 and non-integral values will be rounded down. An error will be raised if the "min-occurs" value is greater than the "max-occurs" value.
"score-function=linear" means that values that are further away from the bounds will score higher. "score-function=reciprocal" means that values that are closer to the bounds will score higher. The functions are scaled appropriately for different types, so that in general the default slope factor will provide useful results. Using a slope factor greater than 1 gives distinct scores over a smaller range of values, and produces generally higher scores. Using a slope factor less than 1 gives distinct scores over a wider range of values, and produces generally lower scores.
// Requires a field named "aname" that includes name and excludes mname
// and a field range index of type xs:string on the field.
//
// Insert few documents with test data
declareUpdate();
var content1 = xdmp.unquote(
'<name><fname>John</fname><mname>Rob</mname><lname>Goldings</lname></name>');
var content2 = xdmp.unquote(
'<name><fname>Jim</fname><mname>Ken</mname><lname>Kurla</lname></name>');
var content3 = xdmp.unquote(
'<name><fname>Ooi</fname><mname>Ben</mname><lname>Fu</lname></name>');
var content4 = xdmp.unquote(
'<name><fname>James</fname><mname>Rick</mname><lname>Tod</lname></name>');
xdmp.documentInsert("/aname1.xml", content1);
xdmp.documentInsert("/aname2.xml", content2);
xdmp.documentInsert("/aname3.xml", content3);
xdmp.documentInsert("/aname4.xml", content4);
******
// requires a field range index of
// type xs:string on field "aname"
cts.search(cts.fieldRangeQuery("aname",">","Jim Kurla"));
=>
<?xml version="1.0" encoding="UTF-8"?>
<name>
<fname>John</fname>
<mname>Rob</mname>
<lname>Goldings</lname>
</name>
<?xml version="1.0" encoding="UTF-8"?>
<name>
<fname>Ooi</fname>
<mname>Ben</mname>
<lname>Fu</lname>
</name>