public long CreateCategory(
	string tag,
	Property[] properties
)

Public Function CreateCategory ( 
	tag As String,
	properties As Property()
) As Long

// create a Category
long catID = myService.CreateCategory("customers", cust_props);
// add markers to our Category
myService.AddMarkerToCategory(catID, markerID);
...
// list first 10 markers
int i = 0;
OT.Category[] categories = service.ListCategories(0, 10);
foreach (Category c in categories)
    Console.WriteLine("Category {0} is tagged '{1}'", i++, c.Tag);