How is this flexibility reflected in the MLI?

The MLI provides for different types of flexibility: jurisdictions can choose amongst alternative provisions in certain MLI articles; jurisdictions can choose to apply optional provisions (for instance, the provisions on mandatory binding arbitration); and, in certain cases, jurisdictions may choose to reserve the right not to apply MLI provisions (to opt out through a “reservation”) with respect to all of their Covered Tax Agreements or with respect to a subset of their Covered Tax Agreements. Jurisdictions only have the possibility to opt out of provisions that do not reflect a BEPS minimum standard, with the possibility to withdraw their reservation (and opt in) later.