The Items Tab on the Rule Properties Dialog allows you to define information about the items to which a rule applies. You define Item 1 and Item 2 by selecting a filter or a catalog item for each. A filter allows you to specify an extensive class of items to which the rule applies. A catalog item allows you to specify a single, specific catalog item or symbol. For example, if you want a rule to apply between nozzles and vessels, define Item 1 by using a filter for nozzles and Item 2 by using a filter for vessels.
For each item, you can specify a connect point type. Some of the placement methods use connect points to calculate the placement geometry. For methods that use connect points, you must specify an appropriate Connect point type.
A rule can apply to a pair of items or a single item. For rules that apply to a single item, you must use Item 1 to define the item and set Item 2 to Freestanding. The software needs rules that apply to a single item to support placement of items in free space without relationships to other items. For example, if you want to place a vessel in free space, define Item 1 by using a filter for vessels and Item 2 as Freestanding.
For each item, you can specify a placement method that defines how to place the item relative to the other item. Placement method controls orientation of the geometry and relationships that the software creates when you place the item. For example, if you want to place nozzles on vessels, you can define a placement method for Item 1, the nozzle.