ADD_INTERFACE (Separating_group_spanner, "separation-spanner-interface",
"A spanner that calculates spacing constraints (\"rods\") "
"using the @code{separation-item-interface} grobs in @code{elements}.",
ADD_INTERFACE (Separating_group_spanner, "separation-spanner-interface",
"A spanner that calculates spacing constraints (\"rods\") "
"using the @code{separation-item-interface} grobs in @code{elements}.",