## 13 BOND OPTIONS PRODUCT ARCHITECTURE

### 13.1 Introduction

This section provides an in-depth review of the product architecture of FpML 5.3 regarding Bond and Convertible Bond Options. It also covers the set of shared option constructs that are used by other types of options, not only Bond or CB options.

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13.1.1 bondOption

The bondOption product element provides support for Bond and Convertible Bond options. Like all other derivative products supported by FpML, the BondOption type is an extension of Product and the bondOption element belongs to the FpML product substitution group.

### 13.2 Shared Option Components

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13.2.1 OptionBase

The OptionBase type defines the schema structure associated with optionType: The type of option transaction. From a usage standpoint, put/call is the default option type, while payer/receiver indicator is used for options index credit default swaps as well as the swaptions. Straddle is used for the case of straddle strategy, which combines a call and a put with the same strike. The optionType is to be used if the underlyer does not carry any mention of the resulting trade direction as well as in the case of a straddle.

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13.2.2 OptionBaseExtended

Incorporates features that are not underlyer-specific and cannot be integrated as part of the OptionBase because of backward compatibility reasons with the eqd schema.

##### 13.2.2.1 Premium

The premium construct has a similar approach than the swaption (i.e. premium based upon a premium construct), but introduces a simplified payment that does not incorporate the settlement features. In order to make this construct forward applicable to the equity options, this new SimplePayment is then extended to incorporate some premium-specific concepts that currently exist as part of the eqd schema.

##### 13.2.2.2 Exercise

The overall approach is to leverage the swaption constructs, both for the Exercise and the ExerciseProcedure, with a couple of backward compatible extensions to tackle some specific features.

The proposed extension is for the multiple exercise, where the existing Multiple Exercise only support notional amounts, while the template for convertible bonds refers to number of options:

Multiple Exercise: | Applicable
Minimum Number of Options: | The lesser of (i) [ ] and (ii) the unexercised number of Options
Maximum Number of Options: | The unexercised number of Options
Integral Multiple: | 1

As a result, the new schema introduces choice nodes to provide the ability to express the minimum/maximum levels either in terms of notional amounts (swaptions) or number of options (bond and CB options).

In addition, the notionalReference node is made optional, as this reference is not used in the case of options on securities.

##### 13.2.2.3 The Notional construct

This provides the ability to support the notional for CDS option as expressed in the ISDA template, i.e. as a reference to the notional of the underlyer swap or as an explicit amount.

##### 13.2.2.4 The Denomination construct

This requirement was identified in the case of bond and CB option. Not CDS options. The structure positions an explicit construct as part of the base type, so that it can be applied over time to the equity options. The currency has been added, as it is present as part of the bond and CB option confirmations.

### 13.3 The Option on Bond and Convertible Bond

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13.3.1 The strike

The market practice consists in pricing convertible bond options based upon a swap curve, while also to include 'standard penalty' (called Make Whole Amount) in the case where the option is exercised early one. Conversely, the bond options are priced using a price reference.

As a result, the BondOptionStrike provides a choice between a swap curve reference and a price.

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13.3.2 The convertible bond underlyer

Two changes have been added to the convertible bond underlyer in order to support options on convertible bonds:

- Added the redemption date (defined as "Earlier date between put dates and maturity date."), as it is specified as part of the CB option template;
- Made the underlyingEquity optional, for consistently with the guideline for underlying assets (internal systems just reference the instrumentId).

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