[R] try catch block

[ppatel3026]

How can I use the try catch block such that if this statement fails 
xml <- xmlTreeParse(xmlTxt, useInternal=TRUE)

then this statement is executed

xml <- xmlMalFormed()

?

This code does not work but assuming its somewhere along these lines: 
tryCatch(xml <- xmlTreeParse(xmlTxt, useInternal=TRUE), xml <-
xmlMalFormed(f1))


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