Toplofikatsia Sofia (2024) clarifies that while the domicile of individuals is determined by national law, Brussels Ibis forbids a national rule that deduces the existence of domicile solely from nationality to ensure the effect; this concerns Bulgaria.

Prepare for the DIPR Jurisprudence Test. Utilize flashcards, multiple-choice questions, and comprehensive explanations to enhance your understanding and readiness for the exam.

The key idea is that Brussels Ibis uses domicile as the connecting factor for jurisdiction, but it cannot be determined by nationality alone. National rules must avoid inferring someone's domicile purely from their nationality, because such a rule could misapply the Regulation and undermine its effect across member states. The Bulgarian context in Toplofikatsia Sofia (2024) illustrates this: while domicile is ultimately determined by the national law of the member state concerned, a rule that deduces domicile solely from nationality would violate Brussels Ibis. That makes the option stating that Brussels Ibis forbids deducing domicile solely from nationality to ensure the Regulation's effect the correct interpretation, and it notes the issue in the Bulgarian context. The other statements are inconsistent with Brussels Ibis: domicile is not determined by nationality in all cases, it is not always defined purely by residence, and Brussels Ibis does address how domicile relates to jurisdiction.