Dump the contents of a runtime DataSpace into the template output.
<dev:dataspace />
May not nest other tags or content (ENDTAG_FORBIDDEN).
Allows viewing of the contents of a runtime DataSpace, calling the export() function on the DataSpace and display the results with either print_r() or var_dump(). Can be useful, for example, to see the current values stored in a FormComponent DataSpace, allowing you to examine the values passed via a post.