Change Result Sorting (Display Order)

By default, HPE IDOL Server lists query results in order of relevance. To weight and rank the documents it returns by statistical relevance, HPE IDOL Server uses complex algorithms that use a combination of information theory and Bayesian methods. It makes use of information theoretic values calculated dynamically for all concepts on indexing, which allows it to evaluate relevance both as a percentage, and in the case of agents, as absolute values.

In practice, the relevance acts as a measure of the conceptual overlap between the query text and the text within a document. You can affect the relevance in several ways. You can apply extra weight to certain fields by associating a weighting factor with them at indexing time. For example, you can give extra weight when query terms appear in the document title as opposed to the body of the text.

You can change the order in which HPE IDOL Server returns query results by adding the Sort parameter to your Query, Suggest, SuggestOnText, GetTagValues, or GetQueryTagValues action.

Sort Options for Query, Suggest, and SuggestOnText

The following table lists the Sort options that are available for the Query, Suggest, and SuggestOnText actions.

Off Displays results unsorted.
AutnRank Displays results in order of the value in their AutnRankType field. This method lists the document with the highest AutnRankType field value first.
Cluster

Displays results in order of cluster (in decreasing cluster ID order), if you also add Cluster=True to the action.

If you specify Cluster as one of multiple sorting options, it automatically takes precedence over the other sorting methods, even if you did not put it in first place.

Database Displays results in order of database number (in increasing order). Define the database numbers in the HPE IDOL Server configuration file.
Date

Displays results in order of their date (the date contained in the DateType fields). This method lists the most recent document first.

If several documents have the same date, their display order is determined by their autn:docid (document ID) number (the highest autn:docid is listed first).

Distcartesian

Displays results according to their distance from a specified point using Cartesian coordinates (X/Y). The option has this format:

sort=Distcartesian{coordX,coordY}:X:Y

where:

  • coordX is the specified x coordinate.

  • coordY is the specified y coordinate.

  • X is the document field that contains the X coordinate.

  • Y is the document field that contains the Y coordinate.

You must specify two fields in the order X:Y.

Distspherical

Displays results according to their distance from a specified point using spherical coordinates (latitude and longitude). The option has this format:

sort=Distspherical{lat,long}:Latfield:Longfield

where:

  • lat is the specified latitude. Specify latitude positions south of the equator as negative.

  • long is the specified longitude. Specify longitude positions west of the Greenwich Meridian as negative.

  • Latfield is the document field that contains the latitude.

  • Longfield is the document field that contains the longitude.

You must specify two fields in the order latitude:longitude.

DocIDDecreasing Displays results in order of their autn:docid (document ID) number. This method lists the document with the highest autn:docid first.
DocIDIncreasing Displays results in order of their autn:docid (document ID) number. This method lists the document with the lowest autn:docid first.
fieldName:sortMethod

Displays results in the order specified by sortMethod, based on the value of the HPE IDOL Server field fieldName. This option is optimized if fieldName is a MatchType field. The following sort methods are available:

  • alphabetical. Determines the display order of results by the string contained in fieldName. This method lists results in alphabetical order. (Sorting is faster if fieldName is SortType.)

  • decreasing. Determines the display order of results by the number or string contained in fieldName. This method lists the result with the highest number or the result that is last in alphabetical order first. For NumericType fields, this method is equivalent to numberdecreasing. For SortType fields, this method is equivalent to reversealphabetical.

  • increasing. Determines the display order of results by the number or string contained in fieldName. This method lists the result with the lowest number or the result that is first in alphabetical order first. For NumericType fields, this method is equivalent to numberincreasing. For SortType fields, this method is equivalent to alphabetical.

  • numberdecreasing. Determines the display order of results by the number contained in fieldName. This method lists the result with the highest number first. (Sorting is faster if fieldName is NumericType.)

  • numberincreasing. Determines the display order of results by the number contained in fieldName. This method lists the result with the lowest number first. (Sorting is faster if fieldName is NumericType.)

  • reversealphabetical. Determines the display order of results by the string contained in fieldName. This method lists results in reverse alphabetical order. (Sorting is faster if fieldName is SortType.)

Random Displays results in random order.
Relevance

Displays results in order of their relevance. This method lists the document with the highest relevance first.

If documents have the same relevance, this method determines their display order by their autn:docid (document ID) number, and lists the highest autn:docid first.

ReverseDate

Displays results in order of their date (the date contained in the DateType fields). It lists the oldest document first.

If several documents have the same date, this method determines their display order by their autn:docid (document ID) number, and lists the highest autn:docid first.

If you want to sort results by several criteria, you can specify them as follows:

sortOption1+sortOption2+...

Example 1:

http://MyHost:20000/action=Query&Text=presidential elections&Sort=Date

In this example, HPE IDOL Server displays results in order of the document date.

Example 2:

http://MyHost:20000/action=Query&Text=presidential elections&Sort=DRETITLE:reversealphabetical

In this example, HPE IDOL Server displays results in reverse alphabetical order by their DRETITLE.

Example 3:

http://MyHost:20000/action=Query&Text=presidential elections&Sort=Relevance+DRETITLE:alphabetical+Date

In this example, results order by Relevance, then by their DRETITLE, and then by their Date.

Sort for GetTagValues and GetQueryTagValues

The following table lists the Sort options that are available for the GetTagValues and GetQueryTagValues actions.

Off Displays results unsorted.
Alphabetical Determines the display order of results by the string contained in the HPE IDOL Server field. Displays results in alphabetical order.
Date Determines the display order of results by the date contained in the HPE IDOL Server field. This method lists the most recent result first.
NumberDecreasing Determines the display order of results by the number contained in the HPE IDOL Server field. This method lists the result with the highest number first.
NumberIncreasing Determines the display order of results by the number contained in the HPE IDOL Server field. This method lists the result with the lowest number first.
ReverseAlphabetical Determines the display order of results by the string contained in the HPE IDOL Server field. This method displays results in reverse alphabetical order.
ReverseDate Determines the display order of results by the date contained in the HPE IDOL Server field. This method lists the oldest result first.

For the GetQueryTagValues action, these Sort options are also available:

DocumentCount If you set the DocumentCount action parameter to True, you can use this option to display results in order of their document count (in decreasing order).
ReverseDocumentCount If you set the DocumentCount action parameter to True, you can use this option to display results in the reverse order of their document count (in increasing order).

For example:

http://MyHost:20000/action=GetQueryTagValues&FieldName=GRAPE,COUNTRY &Text=A smooth red wine that complements game&Sort=Alphabetical

In this example, HPE IDOL Server displays results in alphabetical order.


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