What is CIVector's CIAttributeTypeRectangle?

I am using Apple's Core Image Filter reference. It references: "A CIVector class whose attribute type is CIAttributeTypeRectangle and whose disp开发者_开发知识库lay name is Rectangle."

I can't find anything anywhere that tells me anything about "attribute type is CIAttributeTypeRectangle" and what "display name is Rectangle." means.

Apple's docs (look under the CICrop Section)

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It should probably say kCIAttributeTypeRectangle rather than CIAttributeTypeRectangle. It refers to:

kCIAttributeTypeRectangle

A Core Image vector that specifies the x and y values of the rectangle origin, and the width (w) and height (h) of the rectangle. The vector takes the form [x, y, w, h]. (A 4-element vector type.)

See kCIAttributeTypeRectangle.

I believe whenever it talks about a "Display name", it's referring to the display name for that particular parameter in Quartz Composer.