How to create a Filter Query for LIS

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Overview

The filter query allows the user to set a predefined query that will perform each time the VHL search is executed. It is a strategy composed of a term or expression and may have the following fields:

  • ti - title
  • au - author
  • mh - subject descriptor
  • kw - keyword
  • tw - text words (include ti, au, mh, kw)
  • thematic_area - thematic area of the resource
e.g.:  mh:"malaria" AND kw:"vector"

Available fields

title (ti)

Specifies that the expression or term will be restricted to the document title field.

e.g.: ti:"fever"

author (au)

Specifies that the expression or term will perform only in the author field.

e.g.: au:"Smith"

subject descriptor (mh)

Specifies that the expression or term will be restricted to the descriptor field. The contents to be searched must be valid DeCS descriptors to avoid 'no results' message.

e.g.: mh:"malaria"

keyword (kw)

Specifies that the expression or term will perform only in the keywords field, which is a free subject field.

e.g.: kw:"breathlessness"

text words (tw)

Specifies that the expression or term will be performed on a group of fields that comprises title, author, descriptors and keywords.

e.g.: tw:"yellow fever"
      tw:"malaria"

thematic area of the resource (thematic_area)

Specifies a subset of LIS records related to a specific thematic area.

e.g.: thematic_area="Cancer control"

Available logical operators and connectors

Expressions can be built using logical operators such as: AND, AND NOT, OR, as well as parenthesis for grouping subexpressions.

e.g.: ti:"fever" AND mh:"malaria"
      (mh:"Cross-Sectional Studies" OR mh:"Longitudinal Studies") AND (tw:"HIV" OR tw:"AIDS" OR tw:"Acquired Immunodeficiency Syndrome")