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29 **Classes**: You can add one or more classes to a data block by placing them in the opening tag. Classes are separated by spaces, so class names declared in this way can not contain spaces. (Note that declaring a class name is effectively the same as adding a ''is a: person'' field-value pair to the data block.)
126 **Grouping**: By adding a ''group'' block zero or more variables can be grouped. This means that all results that have the same value for the grouped variable will be merged, and the ungrouped variables will contain multiple values. You can name one variable per line. If the ''group'' is empty //all// results will be merged into a single result.
128 **Sorting**: By adding ''sort'' you can define one or more variables to sort on. You can name one variable per line, and include a direction with ''(ascending)'' or ''(descending)'' (or their short-hands ''(asc)'' and ''(desc)'').
171 As a convenience, you can attach one or more classes to the data by putting them in the opening: ''<data **person**>''. To add multiple classes, separate them with a space.
261 It is possible to use both variables and literals for left and right, but there must be at least one variable present. You can only use variables that are used in a pattern in the same block or inner blocks (with the exception of [[#minus]] blocks, which don't bind any variables).
341 You can sort on one or more variables.
352 Grouping on one or more variables allows you to create overviews.
389 If a variable is not mentioned as one of the displayed fields, it will be ignored. You can hint that some field needs to be considered, but not displayed.
450 When multiple columns have the same name, settings are applied to all columns that have the given name. To identify specific columns, index them by number. If you use both a block with a name (e.g. ''%%Relation%%'') and one with a number (e.g. ''%%#2%%''), then all settings specified in the numbered block will override the ones specified in the named block. (If you name a column ''%%#2%%'', then ''%%#2%%'' is considered a name, not a number.)
495 In general, the UI is quite intuitive, but combining it with aggregates might give unexpected results (unless you use a table, in which case no special handling is needed). The example below shows the column ''%%address%%'' twice: once the actual values and once the number of values. Because the UI creates filters per column, only one filter will be created for the ''%%address%%'' column. This filter filters both on addresses and number of addresses per person.
517 As shown below, the above query can easily be converted to one which lists each column only once and, therefore, does have separate filters for the address count and the addresses.