Add 'cowl_{obj,data}_card_is_qualified'

include/cowl_data_card.h

@@ -78,6 +78,18 @@ CowlCardType cowl_data_card_get_type(CowlDataCard *restr) {
     return (CowlCardType)(cowl_get_type(restr) - COWL_OT_CE_DATA_MIN_CARD);
 }
 
+/**
+ * Checks if the specified data property cardinality restriction has a range.
+ *
+ * @param restr The restriction.
+ * @return True if the restriction has a range, false otherwise.
+ */
+COWL_PURE
+COWL_INLINE
+bool cowl_data_card_is_qualified(CowlDataCard *restr) {
+    return cowl_has_opt_field(restr);
+}
+
 /**
  * Gets the property of the restriction.
  *

include/cowl_obj_card.h

@@ -78,6 +78,18 @@ CowlCardType cowl_obj_card_get_type(CowlObjCard *restr) {
     return (CowlCardType)(cowl_get_type(restr) - COWL_OT_CE_OBJ_MIN_CARD);
 }
 
+/**
+ * Checks if the specified object property cardinality restriction has a filler.
+ *
+ * @param restr The restriction.
+ * @return True if the restriction has a filler, false otherwise.
+ */
+COWL_PURE
+COWL_INLINE
+bool cowl_obj_card_is_qualified(CowlObjCard *restr) {
+    return cowl_has_opt_field(restr);
+}
+
 /**
  * Gets the property of the restriction.
  *