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/**
@page tut_enum Enumerating possible production chains
The following code shows how to fine control the enumeration process. It enumerates Production Chains
for producing User output, reducing the options using a basic query, and then chooses the first one
from all possibilities.
@code
// Build a query object
xn::Query query;
nRetVal = query.SetVendor("MyVendor");
// TODO: check error code
query.AddSupportedCapability(XN_CAPABILITY_SKELETON);
// TODO: check error code
// Enumerate
xn::NodeInfoList possibleChains;
nRetVal = context.EnumerateProductionTrees(XN_NODE_TYPE_USER, &query, possibleChains, NULL);
// TODO: check error code
// No errors so far. This means list has at least one item. Take the first one
xn::NodeInfo selected = *possibleChains.Begin();
// Create it
nRetVal = context.CreateProductionTree(selected);
// TODO: check error code
// Take the node
xn::UserGenerator userGen;
nRetVal = selected.GetInstance(userGen);
// TODO: check error code
// Now we can start to use it
@endcode
*/
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