SysML R-85: SysML diagrams show only SysML-stereotyped elements
Nicolas Rouquette / Dec 12, 2011
As discussed in the SysML 1.4 RTF meeting today, it is currently unclear whether all of the elements shown in SysML diagrams have a SysML stereotype applied or not.
In some cases, there is an explicit mention about the meaning of SysML diagrams, e.g., 11.3.1.1 Activity:
Activities in block definition diagrams appear as regular blocks, except the «activity» keyword may be used to indicate the Block stereotype is applied to an activity, as shown in Figure 11.1. 
We need a clarification whether the meaning of SysML diagrams is that they show only SysML-stereotyped elements or not and if not which UML elements can be shown on a SysML diagram without any SysML stereotype applied.