Extend appellation

Author: nichtich

index.qmd

@@ -22,7 +22,7 @@ CRM defines abstract types of entities (CRM classes) such as events, measurement
 
 - instances of [E60 Number](http://www.cidoc-crm.org/cidoc-crm/E60) are expressed as RDF literals with numeric data type such as `xsd:integer`
 
-The CRM classes [E61 Time Primitive], [E94 Space Primitive], and [E95 Spacetime Primitive] are both subclasses of [E59 Primitive Value] and of [E41 Appellation], so the latter can be used when a mapping to established RDF data types is not applicable.
+The CRM classes [E61 Time Primitive], [E94 Space Primitive], and [E95 Spacetime Primitive] are both subclasses of [E59 Primitive Value] and of [E41 Appellation], so [the latter](#e41-appelation) can be used when a mapping to established RDF data types is not applicable.
 
 Instances of **[E61 Time Primitive] and [E52 Time-Span]** are better expressed as RDF literals of type `xsd:date`, `xsd:time`, `xsd:dateTime`, or `xsd:dateTimeStamp` if applicable. More complex time values should be expressed using the [Extended Date/Time Format (EDTF)](https://www.loc.gov/standards/datetime/) but there is no established method to calculate with dates in RDF yet.^[See discussion to extend SPARQL [for simple dates](https://github.com/w3c/sparql-dev/blob/main/SEP/SEP-0002/sep-0002.md) and [EDTF in RDF](https://periodo.github.io/edtf-ontology/).] CRM includes its own classes and properties to model more complex temporal values so this has not been decided yet.
 
@@ -64,15 +64,6 @@ Instances of [E95 Spacetime Primitive] ... (TODO)
 [P172 contains]: http://www.cidoc-crm.org/cidoc-crm/P172
 [P168 place is defined by]: http://www.cidoc-crm.org/cidoc-crm/P168
 
-
-[E52 Time-Span]: http://www.cidoc-crm.org/cidoc-crm/E52
-[E53 Place]: http://www.cidoc-crm.org/cidoc-crm/E53
-[E41 Appellation]: http://www.cidoc-crm.org/cidoc-crm/E41
-[E59 Primitive Value]: http://www.cidoc-crm.org/cidoc-crm/E59
-[E61 Time Primitive]: http://www.cidoc-crm.org/cidoc-crm/E61
-[E94 Space Primitive]: http://www.cidoc-crm.org/cidoc-crm/E94
-[E95 Spacetime Primitive]: http://www.cidoc-crm.org/cidoc-crm/E95
-
 ### Authority files and types
 
 CRM class [E32 Authority Document] and CRM property [P71 lists] should not be used in RDF but corresponding SKOS RDF classes `skos:ConceptScheme` and `skos:inScheme`. Applications may define `skos:ConceptScheme` as subclass of [E31 Document] and `skos:inScheme` as subproperty of [P67 refers to] if needed.
@@ -83,13 +74,6 @@ CRM also defines class [E55 Type] with properties [P127 has broader term] and [P
 [P127i has narrower term]: http://www.cidoc-crm.org/cidoc-crm/P127i_has_narrower_term
 [P71 lists]: http://www.cidoc-crm.org/cidoc-crm/P71
 [P67 refers to]: http://www.cidoc-crm.org/cidoc-crm/P67
-[E31 Document]: http://www.cidoc-crm.org/cidoc-crm/E31
-[E32 Authority Document]: http://www.cidoc-crm.org/cidoc-crm/E32
-[E55 Type]: http://www.cidoc-crm.org/cidoc-crm/E55
-[E35 Title]: http://www.cidoc-crm.org/cidoc-crm/E35
-[E41 Appellation]: http://www.cidoc-crm.org/cidoc-crm/E41
-[E55 Identifier]: http://www.cidoc-crm.org/cidoc-crm/E42
-[E58 Measurement Unit]: http://www.cidoc-crm.org/cidoc-crm/E58
 
 ### CRM Classes to use with caution
 
@@ -110,7 +94,7 @@ Defintion of instances of [E58 Measurement Unit] should be avoided but either ta
 
 #### E41 Appellation
 
-**[E42 Appellation]** and its subclasses ([E35 Title] and [E42 Identifier]) should be avoided (see [above](#primitive-values) for additional subclasses [E61 Time Primitive], [E94 Space Primitive], and [E94 Space Primitive]):
+**[E41 Appellation]** and its subclasses ([E35 Title] and [E42 Identifier]) should be avoided (see [above](#primitive-values) for additional subclasses [E61 Time Primitive], [E94 Space Primitive], and [E94 Space Primitive]), unless a name cannot uniquely be identified with a sequence of Unicode characters and an optional language tag:
 
 ~~~ttl
 <RMSTitantic>
@@ -125,6 +109,11 @@ If there are multiple names with one preferred name per language and optional na
   skos:altLabel "Titanic"@en, "Royal Mail Steamship Titanic"@en .
 ~~~
 
+The RDF property `skos:prefLabel` should not be confused with [P48 has preferred identifier] to be used for identifiers only. 
+
+
+If information about the act of naming is required, use [E13 Attribute Assignment] for simple appelations or [E15 Identifier Assignment] for identifiers.
+
 If an identifier **[E42 Identifier] is an URI** meant to identify an RDF resource, dont use plain strings but resource URIs in RDF.  If a resource happens to have multiple equivalent URIs, choose a preferred URI and use `owl:sameAs` to record aliases:
 
 ~~~ttl
@@ -153,3 +142,20 @@ CRM is constantly evolving, so some CRM classes have been renamed or replaced. O
 
 ::: {#refs}
 :::
+
+[E13 Attribute Assignment]: http://www.cidoc-crm.org/cidoc-crm/E13
+[E15 Identifier Assignment]: http://www.cidoc-crm.org/cidoc-crm/E15
+[E31 Document]: http://www.cidoc-crm.org/cidoc-crm/E31
+[E32 Authority Document]: http://www.cidoc-crm.org/cidoc-crm/E32
+[E35 Title]: http://www.cidoc-crm.org/cidoc-crm/E35
+[E55 Identifier]: http://www.cidoc-crm.org/cidoc-crm/E42
+[E55 Type]: http://www.cidoc-crm.org/cidoc-crm/E55
+[E58 Measurement Unit]: http://www.cidoc-crm.org/cidoc-crm/E58
+[E52 Time-Span]: http://www.cidoc-crm.org/cidoc-crm/E52
+[E53 Place]: http://www.cidoc-crm.org/cidoc-crm/E53
+[E41 Appellation]: http://www.cidoc-crm.org/cidoc-crm/E41
+[E59 Primitive Value]: http://www.cidoc-crm.org/cidoc-crm/E59
+[E61 Time Primitive]: http://www.cidoc-crm.org/cidoc-crm/E61
+[E94 Space Primitive]: http://www.cidoc-crm.org/cidoc-crm/E94
+[E95 Spacetime Primitive]: http://www.cidoc-crm.org/cidoc-crm/E95
+