Spry Built-in Variables for Datasets

This is mainly for my own reference - but as I always have trouble finding it - I thought I'd share. When working with Spry datasets, you have access to both the data in the set (obviously) as well as a set of built-in variables prefixed by ds_. The variables you can use:

ds_RowID - This is the id of a row in the data set. This id can be used to refer to a specific record in the data set. It does not change even when the data is sorted.
ds_RowNumber - This is the row number of the "current row" of the data set. Within a loop construct, this number reflects the position of the row currently being evaluated.
ds_RowNumberPlus1 - This is the same as ds_RowNumber except that the first row starts at index 1 instead of index 0.
ds_RowCount - This is the number of rows in the data set. If there is a non-destructive filter set on the data set, this is the total number of rows after the filter is applied.
ds_UnfilteredRowCount - This is the number of rows in the data set before any non-destructive filter is applied.
ds_CurrentRowID - This is the id of the "current row" of the data set. This value will not change, even when used within a looping construct construct.
ds_CurrentRowNumber - This is the row number of the "current row" of the data set. This value will not change, even when used within a looping construct.
ds_SortColumn - This is the name of the column last used for sorting. If the data in the data set has never been sorted, this will output nothing (an empty string).
ds_SortOrder - This is the current sort order of the data in the data set. This data reference will output the words "ascending", "descending", or nothing (an empty string).
ds_EvenOddRow - This looks at the current value of ds_RowNumber and returns the string "even" or "odd". This is useful for rendering alternate row colors.