Except the current value of a [variable](invantive-composition-variabele-waarde), you can also use a deviated value. For a header and/or footer it is even impossible to meaningfully use a variable value. You got to choose a group value. The following group values are possible for a variable `$V{naam}`: - `first`: the first value in the series of the variable. Empty if there is no initial value. - `last`: the last value in the series of the variable. Empty if there is no last value. - `previous`: the previous value in the series of the variable. Empty if there is no previous value. - `next`: the next value in the series of the variable. Empty if there is no next value. - `least`: the smallest value in the series of the variable. Empty if there is no smallest value. - `greatest`: the largest value in the series of the variable. Empty if there is no largest value. - `all`: all values in the series of the variable, concatenated together and separated by a comma and space. Empty if there were no values. - `allbutlast`: all values in the series of the variable, concatenated together except for the last one, and separated by a comma and space. Empty if there were no values or only one. - `allbutfirst`: all values in the series of the variable, concatenated together except for the first one, and separated by a comma and space. Empty if there were no values or only one. - `unique`: all unique values in the series of the variable, concatenated together and separated by a comma and space. Empty if there were no values. A group value is formed by the name of the group, followed by a colon in front of the variable name. Of course you can also combine group values ​​with an alias, such as $V{least: pjt.name}. A group value can also be used outside and after a foreach. The values of the last [<invantive:foreach>](invantive-composition-foreach-instructie) are maintained.