ont-app.rdf.core — ont-app/rdf 0.1.4

clj

This is a backstop for shared logic between various RDF-based implementations of IGraph. It includes:

• support for LangStr using the #lstr custom reader
• support for ^^transit:json datatype tags
• templating utilities for the standard IGraph member access methods.

ask-s-p-o clj/s

(ask-s-p-o ask-fn rdf-store s p o)

(ask-s-p-o graph-uri ask-fn rdf-store s p o)

Returns true if s p o is a triple at endpoint of rdf-store Where:

• s p o are subject, predicate and object
• rdf-store is an RDF store
• graph-uri is a URI or KWI naming the graph (or nil if DEFAULT graph)
• ask-fn := fn [repo] -> bindings

ask-s-p-o-template clj/s

bnode-kwi? clj/s

(bnode-kwi? kwi)

True when kwi matches output of bnode-translator.

check-ns-metadata clj/s

(check-ns-metadata kwi)

Logs a warning when kwi is in a namespace with no metadata.

check-qname clj/s

(check-qname uri-spec)

Traps the keyword assertion error in voc and throws a more meaningful error about blank nodes not being supported as first-class identifiers.

normal-form-query-template clj/s

on-js-reload cljs

(on-js-reload)

ontology clj/s

The supporting vocabulary for the RDF module

prefixed clj/s

Returns query, with prefix declarations prepended Where

• query is a SPARQL query

query-for-normal-form clj/s

(query-for-normal-form query-fn rdf-store)

(query-for-normal-form graph-uri query-fn rdf-store)

Returns IGraph normal form for graph named by graph-uri in rdf-store Where

• graph is a named graph in rdf-store
• graph-uri is a URI or KWI naming the graph (default nil -> DEFAULT graph)
• rdf-store is an RDF store
• query-fn := fn [rdf-store sparql-query] -> #{bmap, ...}
• bmap := {:?s :?p :?o}
• sparql-query :- normal-form-query-template

query-for-o clj/s

(query-for-o query-fn rdf-store s p)

(query-for-o graph-uri query-fn rdf-store s p)

Returns #{o...} for s and p at endpoint of rdf-store Where:

• o is an object rendered per binding translator of rdf-store
• s is a subject URI rendered per binding translator of rdf-store
• p is a predicate URI rendered per binding translator of rdf-store
• rdf-store is an RDF store
• query-fn := fn [repo] -> bindings
• graph-uri is a URI or KWI naming the graph (or nil if DEFAULT graph)

query-for-o-template clj/s

query-for-p-o clj/s

(query-for-p-o query-fn rdf-store s)

(query-for-p-o graph-uri query-fn rdf-store s)

Returns {p #{o...}...} for s at endpoint of rdf-store Where

• p is a predicate URI rendered per binding translator of rdf-store
• o is an object value, rendered per the binding translator of rdf-store
• s is a subject uri keyword. ~ voc/voc-re
• rdf-store is and RDF store.
• query-fn := fn [repo] -> bindings
• graph-uri is a URI or KWI naming the graph (or nil if DEFAULT graph)

query-for-p-o-template clj/s

query-for-subjects clj/s

(query-for-subjects query-fn rdf-store)

(query-for-subjects graph-uri query-fn rdf-store)

Returns [subject ...] at endpoint of rdf-store Where

• subject is the uri of a subject from rdf-store, rendered per the binding translator of rdf-store
• rdf-store conforms to ::sparql-client spec
• query-fn := fn [repo] -> bindings
• graph-uri is a URI or KWI naming the graph (or nil if DEFAULT graph)

query-template-defaults clj/s

Default key/value pairs appicable to query templates for your platform. Where

• :graph-name-open opens the named graph expession
• :graph-name-close closes :graph-name-open
• :rebind-_s asserts new binding for ?_s in ?_s ?_p ?_o
• :rebind-_p asserts a new binding the value retrieved for ?_p in ?_s ?_p ?_o
• :rebind-_o aserts a new binding the value retrieved for ?_o in ?_s ?_p ?_o
• NOTE: For example we may assert :rebind-_s as IRI(?_S) in jena to set up bnode round-tripping for ?_s.

quote-str clj/s

(quote-str s)

Returns s, in escaped quotation marks. Where

• s is a string, typically to be rendered in a query or RDF source.

read-transit-json clj/s

(read-transit-json s)

Returns a value parsed from transit string s Where

• s is a "-escaped string encoded as transit Note: custom datatypes will be informed by @transit-read-handlers

render-literal clj/s multimethod

Returns an RDF (Turtle) rendering of literal

render-literal-as-transit-json clj/s

(render-literal-as-transit-json x)

Returns 'x^^transit:json' NOTE: this will be encoded on write and decoded on read by the cognitect/transit library.

render-literal-dispatch clj/s

(render-literal-dispatch literal)

Returns a key for the render-literal method to dispatch on given literal Where

• literal is any non-keyword
• NOTE: LangStr and non-nil special-dispatch are special cases; otherwise (type literal)

render-transit-json clj/s

(render-transit-json value)

Returns a string of transit for value Where

• value is any value that be handled by cognitict/transit
• Note: custom datatypes will be informed by @transit-write-handlers

special-literal-dispatch clj/s

A function [x] -> dispatch-value Where

• x is any value, probabaly an RDF literal
• dispatch-value is a value to be matched to a render-literal-dispatch method. Default is to return nil, signalling no special dispatch.

subjects-query-template clj/s

transit-re clj/s

Matches data tagged as transit:json

transit-read-handlers clj/s

Atom of the form {className read-handler Where

• className is a fully qualified string naming a class to be encoded
• read-handler := fn [from-rep] -> instance
• from-rep := an Object s.t. (field from-rep), encoded in corresponding write-handler in @transit-write-handlers.

transit-write-handlers clj/s

Atom of the form {Class write-handler, ...} Where

• Class is a direct reference to the class instance to be encoded
• write-handler := fn [s] -> {field value, ...}