Difference between Element and Element Type

[Howie]

Hi, I am starting to learn Python in Dynamo with a toy example as shown below. I am wondering what is the difference between Element and Element Type. I noticed that the number of wall elements changed with the calling of WhereElementIsNotElementType(). Does anyone know the reason behind it? Thanks!

collector.dyn (3.1 KB)
The model used is the sample model provided in Revit (rac_basic_sample_project.rvt)

[_Vijay]

Element type is type of elements and Elements is every instance of the element type.

For more information

Difference between FamilySymbol and ElementType?

Elements, Type, and Families

Hello all, I am working with the Elements, Element Types and Families. I was wondering if someone could help clear up how things are selected in dynamo and make sure I have the Revit Hierarchy correct. (Image copied form the Primer. [Capture] Using Element Types with Family Instances and All Elements of Type I get 6,072 elements. What are these elements? Using code from Einar_Raknes in post Collect all categories in a project I get 113,172 Element ID’s. Thats a huge difference in Element cou…

[Howie]

Thanks for the information @_Vijay . But I am still confused. More specifically, what does “WhereElementIsElementType” mean? The API doc says “Only elements that are ElementTypes will pass the collector”. What is “elements that are element types”…
In the script example if I don’t call this method it would be like this, including Autodesk.Revit.DB.WallType and Autodesk.Revit.DB.Wall.