The <sortby>
tag is a container for all the sorting directives, which specify how the targeting results should be sorted. You can include a sorting directive that has been previously defined, or which is defined dynamically, using the src
attribute with the <sortby>
tag. See Including Rule Sets, Rules, and Sorting Directives.
The <sortby>
tag must either use the src
attribute or have at least one child. Each child must be a <sortbyvalue>
tag. The order of the child <sortbyvalue>
tags implies the sorting order: that is, the first child defines the primary sorting criterion, the second child defines the secondary sorting criterion, and so forth.
The <sortby>
tag must be matched by a closing </sortby>
tag.