tag additions

After consideration, the new upgrades to GRML include grouping, sorting, filtering, unions, and joins. These features exist in SQL. Fortunately, SQL offers a rich library of data handling capabilities appropriate to GRML. The problem is determining a non-obtrusive way to describe them using tags.

These are the tags, as proposed, for subsequent versions of GRML.

<group dimension>

Group is a keyword for a parent tag. To use this tag, a dimension is supplied. It determines which columns are available for grouping. The columns to group are the child tags.

<sort dimension>

Sort is a keyword for a parent tag. To use this tag, a dimension is supplied. It determines which columns are available for sorting. The columns to sort are the child tags.

<union>

Union is a keyword for a parent tag. The child tags are any available dimensions. To display multiple dimensions in one view, add them as child tags.

<filter dimension>

Filter is a keyword for a parent tag. Its use is still being determined. However, it is intended to filter results displayed by selected text.

<join dimension>

Join is a keyword for a parent tag. Its use is still being determined. However, it is intended to join multiple dimensions in one view, when they share a column.

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