PG Log MultiLine Records

we have been working on a CSV Log parser application in csharp.
 
we recently discovered that certain log entries or records can span across multiple lines.
 
in the sense, that the same activity has more detail in subsequent lines.
 
For ex, a select,insert query has
A query entry
A Duration entry
A Stats entry
 
and that is why there was a serious coding mistake in counting select entries, because the same select statement
is displayed in Query column twice and once in Detail column
 
So our application counted them as three queries.
 
My query is, has any of us come across more such examples or
:: is there a link or page explaining type of Log entries
:: Number of log statements a logentry type occupy.
:: or other finer details that we may overlook
 
it will be helpfull as we wish to release this application for all pg users at no price.
 
thanks arvind
 
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