docs: don't use kroki

Taskfile.yml

@@ -329,6 +329,19 @@ tasks:
             {{.DOCKER}} image push {{.OCI_REFERENCE}}:latest
             {{.DOCKER}} image push {{.OCI_REFERENCE}}:${_latest_rdflib_version}
           fi
+
+  docs:build-diagrams:
+    desc: Build documentation diagrams
+    cmds:
+      - cmd: |
+          shopt -s globstar;
+          for plantuml_file in ./**/*.plantuml
+          do
+            cat "${plantuml_file}" \
+              | docker run --rm -i plantuml/plantuml -tsvg -pipe \
+              > "${plantuml_file%.*}.svg"
+          done
+
   _rimraf:
     # This task is a utility task for recursively removing directories, it is
     # similar to rm -rf but not identical and it should work wherever there is

docs/_static/term_class_hierarchy.plantuml

@@ -0,0 +1,58 @@
+@startuml
+skinparam shadowing false
+skinparam monochrome true
+skinparam packageStyle rectangle
+skinparam backgroundColor FFFFFE
+
+class Node
+
+class Identifier {
+    eq(other) -> bool
+    neq(other) -> bool
+    startswith(prefix: str, start, end) -> bool
+}
+Identifier -up-|> Node
+
+class IdentifiedNode {
+    toPython() -> str
+}
+IdentifiedNode -up-|> Identifier
+
+class URIRef {
+    n3(namespace_manager) -> str
+    defrag() -> URIRef
+    de_skolemize() -> BNode
+}
+URIRef -up-|> IdentifiedNode
+
+
+class Genid
+Genid -up-|> URIRef
+
+class RDFLibGenid
+RDFLibGenid -up-|> Genid
+
+class BNode {
+    n3(namespace_manager) -> str
+    skolemize(authority, basepath) -> RDFLibGenid
+}
+BNode -up-|> IdentifiedNode
+
+class Literal {
+    datatype: Optional[str]
+    lang: Optional[str]
+    value: Any
+
+    normalize() -> Literal
+    n3(namespace_manager) -> str
+    toPython() -> str
+}
+Literal -up-|> Identifier
+
+class Variable {
+    n3(namespace_manager) -> str
+    toPython() -> str
+}
+Variable -up-|> Identifier
+
+@enduml

docs/conf.py

@@ -44,7 +44,6 @@
     "sphinx.ext.ifconfig",
     "sphinx.ext.viewcode",
     "myst_parser",
-    "sphinxcontrib.kroki",
     "sphinx.ext.autosectionlabel",
 ]
 

docs/rdf_terms.rst

@@ -17,68 +17,11 @@ Class hierarchy
 All terms in RDFLib are sub-classes of the :class:`rdflib.term.Identifier` class. A class diagram of the various terms is:
 
 .. _term_class_hierarchy:
-.. kroki::
-   :caption: Term Class Hierarchy
-   :type: plantuml
-
-    @startuml
-    skinparam shadowing false
-    skinparam monochrome true
-    skinparam packageStyle rectangle
-    skinparam backgroundColor FFFFFE
-
-    class Node
-
-    class Identifier {
-        eq(other) -> bool
-        neq(other) -> bool
-        startswith(prefix: str, start, end) -> bool
-    }
-    Identifier -up-|> Node
-
-    class IdentifiedNode {
-        toPython() -> str
-    }
-    IdentifiedNode -up-|> Identifier
-
-    class URIRef {
-        n3(namespace_manager) -> str
-        defrag() -> URIRef
-        de_skolemize() -> BNode
-    }
-    URIRef -up-|> IdentifiedNode
-
-
-    class Genid
-    Genid -up-|> URIRef
-
-    class RDFLibGenid
-    RDFLibGenid -up-|> Genid
-
-    class BNode {
-        n3(namespace_manager) -> str
-        skolemize(authority, basepath) -> RDFLibGenid
-    }
-    BNode -up-|> IdentifiedNode
-
-    class Literal {
-        datatype: Optional[str]
-        lang: Optional[str]
-        value: Any
-
-        normalize() -> Literal
-        n3(namespace_manager) -> str
-        toPython() -> str
-    }
-    Literal -up-|> Identifier
-
-    class Variable {
-        n3(namespace_manager) -> str
-        toPython() -> str
-    }
-    Variable -up-|> Identifier
-
-    @enduml
+.. figure:: /_static/term_class_hierarchy.svg
+   :alt: Term Class Hierarchy
+
+   Term Class Hierarchy
+
 
 Nodes are a subset of the Terms that underlying stores actually persist.