Functions
This page lists functions that can be used in DQD.
length
Argument: attribute of type text or categorical
Returns: length of the string value (number)
Example:
Token t
length(form) > 3
century
Argument: attribute of type text or categorical that encodes a date
Returns: number representing the century in the value (number)
Example:
Document d
century(pubdate) >= 20
decade
Argument: attribute of type text or categorical that encodes a date
Returns: number representing the decade in the value (number)
Example:
Document d
decade(pubdate) < 90
year
Argument: attribute of type text or categorical that encodes a date
Returns: number representing the year in the value (number)
Example:
Document d
year(pubdate) > 1999
month
Argument: attribute of type text or categorical that encodes a date
Returns: number representing the month in the value (number)
Example:
Document d
month(pubdate) = 3
day
Argument: attribute of type text or categorical that encodes a date
Returns: number representing the day in the value (number)
Example:
Document d
day(pubdate) > 28
position
Argument: entity that is character-aligned
Returns: the position of the entity in the corpus along the character axis (number)
Example:
Segment s
Token@s t
# match only the first token
position(t) = position(s)
range
Argument: entity that is character-aligned
Returns: the number of characters that the entity spans along the character axis (number)
Example:
Segment s
Token@s t
# match only the last token
position(t) + range(t) >= position(s) + range(s) - 1
start
Argument: entity that is time-aligned
Returns: the number in seconds at which the entity starts in the corpus (number)
Example:
Document d
Segment%d s
# match segments within the first second of their document
start(s) < start(d) + 1
end
Argument: entity that is time-aligned
Returns: the number in seconds at which the entity ends in the corpus (number)
Example:
Document d
Segment%d s
# match segments within the last second of their document
end(s) > end(d) - 1