Artikel (4)

The grounds of jurisdiction referred to in the 1st paragraph of article 2 are the following -
(a) the presence in the territory of the State of origin of property belonging to the defendant, or the seizure by the plaintiff of property situated there, unless - - the action is brought to assert proprietary or possessory rights in that property, or arises from another issue relating to such property,
- the property constitutes the security for a debt which is the subject-matter of the action;
- the action is brought to assert proprietary or possessory rights in that property, or arises from another issue relating to such property,
- the property constitutes the security for a debt which is the subject-matter of the action;
(b) the nationality of the plaintiff;
(c) the domicile, habitual residence or ordinary residence of the plaintiff within the territory of the State of origin unless the assumption of jurisdiction on such a ground is permitted by way of an exception made on account of the particular subject - matter of a class of contracts;
(d) the fact that the defendant carried on business within the territory of the State of origin, unless the action arises from that business;
(e) service of a writ upon the defendant within the territory of the State of origin during his temporary presence there;
(f) a unilateral specification of the forum by the plaintiff, particularly in an invoice.