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<P><FONT SIZE=2 FACE="Courier New">Hello Kepler/Ptolemy people</FONT>
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<P><FONT SIZE=2 FACE="Courier New">Please permit me at this time to expand to the Kepler/Ptolemy community at large the context of some questions I sent on Saturday to Christopher Brooks. </FONT></P>
<P><FONT SIZE=2 FACE="Courier New">Does anyone have a simple example of a Java class that can be used in a workflow model for persistent object data. Is this an actor, in this case ?</FONT></P>
<P><FONT SIZE=2 FACE="Courier New">If it is possible to have such persistent data obj, how is it referenced/designated from within actors ? Could it be referenced from within the Expression operator ? </FONT></P>
<P><FONT SIZE=2 FACE="Courier New">I guess along the same lines is the following question I have been meaning to ask for a while. How does one set a particular (indexed) array element in an already declared array ? I presume that this not possible due to the rule of token immutability. Is this so ? </FONT></P>
<P><FONT SIZE=2 FACE="Courier New">If it is not possible to set an array element, then I take it that the only way is something like: get the subarrays that are respectively below and above the element to be set, and then use the Append array actor to create a new array from the following three arrays:</FONT></P>
<P><FONT SIZE=2 FACE="Courier New">{ E1,...,En-1 } { En (new val) } { En+1,...,Enmax }</FONT>
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<P><FONT SIZE=2 FACE="Courier New">This is a tiny bit ugly, no ?</FONT>
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<P><FONT SIZE=2 FACE="Courier New">Note that all of these questions directed to my effort to have persistent data objects (or even structures, such as an array) that are referenceable and mutable. After all, as a workflow model becomes more complex, the necessity for keeping state information around and for accessing it grows.</FONT></P>
<P><FONT SIZE=2 FACE="Courier New">Maurice Yarrow</FONT>
<BR><FONT SIZE=2 FACE="Courier New">Nortel Networks Research Labs</FONT>
<BR><FONT SIZE=2 FACE="Courier New">Santa Clara </FONT>
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