*: The wiki code for the individual calls is available in /p/condor/workspaces/nleroy/OldClassAdWiki -- the summary and detail files above are in there, as well as the code for each of the above, each in it's own file.
{subsection: Additional conversion info}
+{subsubsection: Compatibility Class}
+To ease the transition to new {quote:ClassAds}, we will create compatibility methods that mimic the interface of old {quote:ClassAds}. We will put these methods in a child class to new {quote:ClassAds} called {quote:CompatClassAd}. This child class will be part of the Condor C++ utility library. This leaves the new {quote:ClassAds} library completely independent of other Condor code.
+
+Methods with more than a dozen or so callsites will be emulated in {quote:CompatClassAd} when feasible. Some methods, particularly those dealing with {quote:ExprTrees}, cannot be emulated easily, and the callsites will have to be modified. Once the initial transition is complete, we can update callsites at our leisure, with a large dose of student work, until {quote:CompatClassAd} is no longer needed.
+
{subsubsection: Direct use of ExprTree}
Many parts of the code do the following to evaluate an expression in the context of a {quote:ClassAd}:
*: Parse() to create an {quote:ExprTree}
