Several co-heir parceners may also claim against several co-heir parceners; here there  will be a single action because of the unitary right.]
If an exception lies for the tenant on the thing itself.
 If no exception lies for the tenant against the demandant arising either from the  person of the demandant or from his own person, and that there is a judicial proceeding  is established, by reason of the persons of the judge, the demandant and the  tenant, since a proceeding is the threefold act of these three persons,1 we must see  whether any exception lies for the tenant arising from the thing claimed. If it is  corporeal and an immovable, as land, a tenement or a rent issuing from a tenement,
The demandant must describe the thing he claims with its appurtenances.
 the demandant must at the outset describe the thing he claims, that is, what kind of  thing it is, that it may be known whether he claims land or a rent [or a tenement] with  the appurtenances. Also the quantity, whether it is large or small, [For he must bring  a thing certain before the court lest the judgment be illusory or uncertain, for as to  an uncertain thing a judgment certain cannot be given, though there may sometimes  be a suit for an uncertain thing, the judge or justice, to the extent that it is possible,  ought to give a certain judgment.]2 as where he says I claim against such a one so  many manors, sometimes with the appurtenances, sometimes without; [or] so  many knights fees with the appurtenances, or so many carucates, so many virgates,  so many acres, so many selions, or so many librates, so many solidates,  so many bovates, according to the variety of tenements and as the matter is stated  in writs of right and entry, [provided that the narratio agrees with the writ, for if there  is a departure and the declaration does not agree with the writ the demandant loses,  because no variance is allowed. A variance sometimes is admitted, however, provided  the sense is the same, as where the writ states that he claims two carucates, which  are worth ten pounds3 a year and he says I claim ten librates of land; he does not,  on that account, withdraw from his writ, because he says what amounts to the same  thing; it does not matter whether a thing is done or its equivalent.]
When the demandant has put forward his intentio, the tenant may see whether he holds the whole or not; hence he ought to have the view or what amounts to it.
 When the demandant has thus formulated his claim, the tenant ought to consider  whether he holds all the land claimed, part of it, or