Outcome of the Berlin meeting (42nd) November 2018:
- the new A10 Excavation Interface class to be included in CRMarchaeo documentation, also there is no need to introduce a new APxx property since O7 confined could be used instead. O7 has as range S10 Material Substantial but this is consistent with S22 Segment of Matter, as once is dug out it corresponds to an S10.
- Adjustment of the range of the property AP4 Created Surface from S20 Rigid Physical Feature to A10 Excavation Interface
Discussion in the Cologne meeting (40th) January 2018):
The SIG expressed concerns about to many confine properties and suggested that one could introduce a common superclass of the two classes A10 Excavation Interface and A3 Stratigraphic Interface, and also a superclass for the A2 Stratigraphic Volume Unit.
Response to this discussion in the Cologne meeting
In both geological and archaeological stratigraphy, we find the concepts surface/interface and the layer/stratum. A surface/interface has no volume in contrast to a layer/stratum. The following classes and the connected properties can be used to model geological stratification as well as archaeological:
A2 Stratigraphic Volume Unit
A3 Stratigraphic Interface
A4 Stratigraphic Genesis
A5 Stratigraphic Modification
A8 Stratigraphic Unit
The three classes below (and the connected properties) involve actors (humans) and could be used in geological fieldwork and definitely in paleontological fieldwork:
A1 Excavation Process Unit
A6 Group Declaration Event
A9 Archaeological Excavation
The CRMarceo is to a large extent well suited to model geological stratigraphy as well as archaeological. If there had been a demand for an extension for geology, one should considere a common stratigraphic extension “CRMstrat” for a “CRMgeology” and CRMarcheo. Since this is not the case, one should stick to CRMarcheo as an extension of CRMsci. Still CRMarcheo can be simplified by “lifting” some of the properties from CRMarcheo into CRMsci.
For example, in the Norwegian digital excavation records I have inspected, one records the information that a profile (instance of A10 Excavation Interface) cuts through one or many stratigraphic structures (instances of A8 Strategraphic Unit). This is common in a non-single-context excavation, where vertical profiles are dug through structures, say postholes. This information is currently not possible to express in a CRMarcheo compliant form. There are at least two solutions:
Extend CRMarcheo with two properties similar to AP11 has physical relation (is physical relation of):
APxx has physical relation (is physical relation of):
Domain:A10 Excavation Interface
Range: A8 Stratigraphic Unit
APyy has physical relation (is physical relation of):
Domain:A10 Excavation Interface
Range: A10 Excavation Interface
In addition one will need a new property
Ayy confines (is confined by)
Domain: A10 Excavation Interface
Range:A2 Strategraphic Unit
Lift (generalize) the domain and range AP11 has physical relation (is physical relation of) to ‘S20 Rigid Physical Feature’ and either keep it as a property of CRMarcheo or better make it a new property in CRMsci. The property AP11.1 has type will be replaced by a .1 for the new property.
Use the CRMsci property O7 confined (was confined by) everywhere and delete AP12 confines (is confined by)
To avoid this proliferation of properties , the following proposal is made:
1) Delete AP12 confines (is confined by) and use O7 confined (was confined by)
2) Lift (generalize) the domain and range of AP11 has physical relation (is physical relation of) to ‘S20 Rigid Physical Feature’ make it a new property in CRMsci.
Oxx has physical relation (is physical relation of)
Domain: S20 Rigid Physical Feature
Range: S20 Rigid Physical Feature
The property AP11.1 has type will be replaced by a Oxx.1 for the new property.
The name of AP11 is misleading since it indicate that the range instance is the
type of relation and not another stratigraphic layer/surface which is in relation to the domain instance. The cardinality should be (0,n, 0,n) and not (0,n:0,1). A draft of the new property can be