A single reifier can reify more than one triple term

I wish to insist on the meaningfulness of my example:

<< :b1 | :enrico :born-in :rome >> :date 1962 .
<< :b1 | :enrico :born-on 1962 >> :location :rome .

Please read on to understand my argument.

Suppose there is a database in the registry office:

BIRTH-CERTIFICATE
+-----+---------+----------+------+
| ID  |  name   | location | date |
+-----+---------+----------+------+
| :b1 | :enrico | :rome    | 1962 |
| :b2 | :mary   | :rome    | 1962 |
| :b3 | :enrico | :rome    | 1980 |
| :b4 | :mary   | :rome    | 1980 |
| :b5 | :enrico | :milan   | 1962 |
| :b6 | :mary   | :milan   | 1962 |
| :b7 | :enrico | :milan   | 1980 |
| :b8 | :mary   | :milan   | 1980 |
+-----+---------+----------+------+
  Primary Key: ID
  Alternate Key: name, location, date

It is important to notice that no pair among the three attributes name, location, date is sufficient to identify a birth certificate.
Two departments decide to expose this data as LOD, but in different ways.

Generated graph-1:

<< :b1 | :enrico :born-in :rome >> :date 1962 .
<< :b2 | :mary :born-in :rome >> :date 1962 .
<< :b3 | :enrico :born-in :rome >> :date 1980 .
etc

Observe that they had to choose a different name for the attribute within the context of the triple term: this is because the predicate :born-in in the triple term relates the name of a person with its birth location, as opposed the attribute :location which relates a birth certificate with the birth location of the name of a person at a certain date.

Similarly for the second department - they also changed the predicate :date to :born-on:

Generated graph-2:

<< :b1 | :enrico :born-on 1962 >> :location :rome .
<< :b2 | :mary :born-on 1962 >> :location :rome .
etc

If we merge the two LOD graphs (set union):

<< :b1 | :enrico :born-in :rome >> :date 1962 .
<< :b1 | :enrico :born-on 1962 >> :location :rome .
etc

which entails

<< :b1 | :enrico :born-in :rome >> :location :rome .
<< :b1 | :enrico :born-on 1962 >> :date 1962 .
etc

➡️ Observe that even if it seems that there is redundant information, the predicates are different (:born-in vs :location, and :born-on vs :date). This is because they serve different purposes: one applies to the name of a person, the other applies to a certificate.

I hope this clarifies:

  1.  the need to allow a reifier to reify two distinct triple terms;
  2.  the possibility to express the same information in different ways.

cheers
—e.