Review `rdflib` package

[gjwgit]

Description

Review the current API and propose new API that will support common RDF operations that we have used throughout our flutter apps.

Why

So that we can have a simplified interface to make it really easy for the flutter app developer to process RDF data.

[jesscmoore]

• what are the functions we have there,
• what are we using in the Indi and Podnotes apps?
• what can we can streamline by adding to rdflib package?
• update podnotes to fully utilise rdflib

[zheyxu]

what are we using in the Indi and Podnotes apps?

INDI app:

void parseTurtle(String fileContent) Parses a valid turtle file read into a string [fileContent]. Updates [Graph.ctx], [Graph.groups] and [Graph.triples] in the process.
bool inNamespace(Namespace ns) Checks if a full URIRef contains the namespace.
Set objects(URIRef sub, URIRef pre) Finds all objects which have a certain subject and predicate.
URIRef withAttr(String attr) This is used to further shorten the namespace binding.

Clinic app:

void parseTurtle(String fileContent) Parses a valid turtle file read into a string [fileContent]. Updates [Graph.ctx], [Graph.groups] and [Graph.triples] in the process.
bool inNamespace(Namespace ns) Checks if a full URIRef contains the namespace.
Set objects(URIRef sub, URIRef pre) Finds all objects which have a certain subject and predicate.
URIRef withAttr(String attr) This is used to further shorten the namespace binding.

Form app:

bool addNamedIndividualToGroups(dynamic s) Adds named individual to graph: rdf:type owl:NamedIndividual.
void addTripleToGroups(dynamic s, dynamic p, dynamic o) Adds a triple to group using its string forms.
void addObjectProperty(URIRef obj, URIRef relation, URIRef prop) Adds object property to link two triple subjects together.
void bind(String name, Namespace ns) Binds a namespace to a prefix for better readability when serializing.
void serialize({String format = 'ttl', String? dest, String? abbr}) Serializes the graph to certain format and export to file.

Podnotes app:

void parseTurtle(String fileContent) Parses a valid turtle file read into a string [fileContent]. Updates [Graph.ctx], [Graph.groups] and [Graph.triples] in the process.