Generates a query expression for matching a transcript/participant attribute, for use with getMatches

This function generates a query expression fragment which can be passed as the transcript.expression or participant.expression parameter of getMatches, (or the expression parameter of getMatchingTranscriptIds or getMatchingParticipantIds) matching by the number of values for a given attribute.

Usage

expressionFromAttributeValuesCount(
  transcript.attribute,
  comparison = "==",
  count
)

Arguments

transcript.attribute

The transcript attribute to filter by.

comparison

A string representing the operator to use for comparison, one of "<", "<=", "==", "!=", ">=", ">".

count

The number to compare the count of values to.

Value

A transcript query expression which can be passed as the transcript.expression parameter of getMatches or the expression parameter of getMatchingTranscriptIds

Details

The attribute defined by transcript.attribute is expected to have possibly more than one value, although single-value attributes may have 0 or 1 values, and this function can be used to distinguish these two possibilities as well.

See also

expressionFromAttributeValues

expressionFromTranscriptTypes

expressionFromIds

getMatches

Examples

if (FALSE) { # \dontrun{
## Search only transcripts including multilingual participants
results <- getMatches(labbcat.url, list(segment="I"),
                      participant.expression = expressionFromAttributeValuesCount(
                            "participant_languages", ">=", 2))

## Search only transcripts with no restrictions specified
results <- getMatches(labbcat.url, list(segment="I"),
                      transcript.expression = expressionFromAttributeValuesCount(
                            "transcript_restrictions", "==", 0))
} # }