Tikz-uml create nesting relation

Question

I am using tikz-uml, but it seems there is not UML nesting relationship. I am not very good with tikz could you help me how I can implement it. You can see how it should look here at the end under title "Nestings".

For example, here is how aggregations is implemented

\tikzstyle{tikzuml aggregation style}=[color=\tikzumldrawcolor, open diamond-]%
\newcommand{\umlaggreg}[3][]{\umlrelation[style={tikzuml aggregation style}, #1]{#2}{#3}}%

Answer 1

I had the same problem with tikz-uml and I used the following approach. The tikzset option was taken over from this answer.

\tikzset{cross/.style={cross out, draw=black,
         minimum size=2*(#1-\pgflinewidth), inner sep=0pt, outer sep=0pt},
         %default radius will be 1pt. 
         cross/.default={1pt}}

\begin{tikzpicture}    
  \begin{umlpackage}{Package}
    \umlclass{Class}
    {
    }
    {
      + <<Creator>> Class()
    }        

    \umlclass[y=-3]{InnerClass}
    {
    }
    {
      + <<Creator>> InnerClass()
    }

    \node[circle, scale=0.5, minimum size =2pt,
          draw] (Nested) at (0, -0.7) {};
    \draw (0, -0.7) node[cross=2pt,rotate=45]{};
    \draw (InnerClass.north) -- (Nested.south);
  \end{umlpackage}
\end{tikzpicture}  

This produces the following diagram:

Answer 2

I will make a new release of tikz-uml soon and add this new relation. It will be called \umlnesting