about "schema inference" feature in Jaql

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Hello,

After reading the Jaql Paper "Jaql: A Scripting Language for Large
Scale Semistructured Data Analysis", I have one question about the
"Schema Inference" feature and how jaql eninge can understand the data
with partial schema.

Can you explain more about the schema inference feature which was
mentioned in Section 5.4 "Processing Semistructured Data"?

I've downloaded the jaql code.
Where can I start to get a deaper understanding about the schema
inference in the Jaql source code. (i.e. which java files? which
function? would be helpful)

Thanks,