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The \lstinline!CallableSwapData! node is the trade data container for the \emph{CallableSwap} trade type. A Callable Swap is a
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two-legged swap that can be cancelled at predefined dates by one of the counterparties. A Callable Swap must have two legs,
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one fixed and one floating, each described by a \lstinline!LegData! trade component sub-node as described in section
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\ref{ss:leg_data}. There must be at least one full coupon period after the exercise date for European
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Callable Swaps, and after the last exercise date for Bermudan and American Callable Swaps. The \lstinline!CallableSwapData! node also contains an \lstinline!OptionData! node which describes
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swap that can be cancelled at predefined dates by one of the counterparties. A Callable Swap must have at least one leg, each leg described by a \lstinline!LegData! trade component sub-node as described in section
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\ref{ss:leg_data}.
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There must be at least one full coupon period after the exercise date for European Callable Swaps, and after the last exercise date for Bermudan and American Callable Swaps.
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The \lstinline!CallableSwapData! node also contains an \lstinline!OptionData! node which describes
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the exercise dates and specifies which party holds the call right, see \ref{ss:option_data}. An example structure of a
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\lstinline!CallableSwapData! node is shown in Listing \ref{lst:callableswap_data}.
underlying Swap. A Callable Swap must have at least one leg on the underlying Swap, but can have multiple legs,
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i.e. multiple \lstinline!LegData! nodes. The LegType elements must be of types \emph{Floating}, \emph{Fixed} or
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\emph{Cashflow}. All legs must have the same \lstinline!Currency!.
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Note that the direction of the legs, determined by the \lstinline!Payer! tag, is like for a Swap, from the perspective of the party to the trade. I.e. unlike for a Swaption where the direction of the legs is from the perspective of the party that is long.
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