Humane OWL RDF and OWL for humans.

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# Define your prefixes...
PREFIX rdf:> http://www.w3.org/1999/02/22-rdf-syntax-ns#
PREFIX rdfs:> http://www.w3.org/2000/01/rdf-schema#
PREFIX xsd:> http://www.w4.org/2001/XMLSchema#
PREFIX owl:> http://www.w3.org/2002/07/owl#
PREFIX obo:> http://purl.obolibrary.org/obo/
PREFIX ex:> http://example.com/
# then abbreviate your IRIs
# so <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
# can be shortened to: rdf:type
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# Set a base IRI...
BASE http://example.com/
# then use relative IRIs in angle brackets: < >
# so <http://example.com/howl-demo.owl> 
# can be shortened to <howl-demo.owl> 
<howl-demo.owl>
rdfs:label: Example Ontology
rdf:type:> owl:Ontology
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# Specify your own labels...
LABEL rdf:type: type
LABEL rdfs:label: label
LABEL rdfs:comment: comment
LABEL rdfs:subClassOf: subclass of
LABEL owl:equivalentClass: equivalent to
LABEL obo:IAO_0000115: definition
# then use them in your statements
ex:frog
label: Frog
definition: A circular definition of frog.
# Your 'rdfs:label' statments also specify labels
# that you can use in subsequent statements,
# e.g. 'label: Frog' can be used as Kermit's type
ex:kermit
type:> Frog
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# Set a language or datatype...
TYPE label:> @en
TYPE comment:> xsd:string
ex:french-fries
# that will apply by default
label: French Fries
comment: A comment string
# but can be overridden
label: Frites@fr
comment: 1000^^xsd:integer
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# It's easy to use tables with HOWL
# and define many terms concisely
SUBJECT          label:                      type:>
obo:BFO_0000040  material entity             owl:Class
obo:BFO_0000051  has part                    owl:ObjectProperty
obo:BFO_0000055  realizes                    owl:ObjectProperty
obo:IAO_0000030  information content entity  owl:Class
obo:IAO_0000112  example of usage            owl:AnnotationProperty
obo:IAO_0000115  definition                  owl:AnnotationProperty
obo:IAO_0000117  term editor                 owl:AnnotationProperty
obo:IAO_0000118  alternative term            owl:AnnotationProperty
obo:IAO_0000119  definition source           owl:AnnotationProperty
obo:IAO_0000136  is about                    owl:ObjectProperty
obo:OBI_0000011  planned process             owl:Class
obo:OBI_0000067  evaluant role               owl:Class
obo:OBI_0000070  assay                       owl:Class
obo:OBI_0000293  has_specified_input         owl:ObjectProperty
obo:OBI_0000299  has_specified_output        owl:ObjectProperty
obo:OBI_0000417  achieves_planned_objective  owl:ObjectProperty
obo:OBI_0000441  assay objective             owl:Class
obo:RO_0000087   has role                    owl:ObjectProperty
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# EDIT ME!
# Then press "Convert" to see the results of your changes below!
# Lines that start with '#' are just comments.
# Set the current subject using a label, prefixed name, or IRI
assay
definition: A planned process with the objective to produce information about the material entity that is the 
    evaluant, by physically examining it or its proxies.
type:> owl:Class
equivalent to:>> achieves_planned_objective some 'assay objective'
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# Use ': ' for literal values: strings, numbers, dates, etc.
example of usage: Assay the wavelength of light emitted by excited Neon atoms. Count of geese flying over a 
    house.
# Use ':> ' for links: IRIs, prefixed names, or labels
subclass of:> planned process
# Use ':>> ' for complex expressions
subclass of:>> realizes some 'evaluant role'
# Use indentation to continue long lines
subclass of:>> has_specified_input some
  ('material entity'
   and ('has role' some 'evaluant role'))
subclass of:>> has_specified_output some
  ('information content entity'
   and ('is about' some
      ('material entity'
       and ('has role' some 'evaluant role'))))
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# Easily add OWL annotations, even annotations on annotations...
ex:another-subject
label: Another Subject
comment: A comment on 'label: Another Subject'.
> comment: An annotation on a comment.
>> comment: An annotation on an annotation.
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# Change to a named graph
GRAPH ex:example-graph
label: Example Graph
ex:first-example-subject
comment: This subject is in the Example Graph.
# Then back to the default graph
GRAPH
ex:second-example-subject
comment: This subject is in the default graph.
# WARNING: OWL only uses the default graph!
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# All the pieces above in a single HOWL file.
### Prefixes
# Define your prefixes...
PREFIX rdf:> http://www.w3.org/1999/02/22-rdf-syntax-ns#
PREFIX rdfs:> http://www.w3.org/2000/01/rdf-schema#
PREFIX xsd:> http://www.w4.org/2001/XMLSchema#
PREFIX owl:> http://www.w3.org/2002/07/owl#
PREFIX obo:> http://purl.obolibrary.org/obo/
PREFIX ex:> http://example.com/
# then abbreviate your IRIs
# so <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
# can be shortened to: rdf:type
### Base
# Set a base IRI...
BASE http://example.com/
# then use relative IRIs in angle brackets: < >
# so <http://example.com/howl-demo.owl> 
# can be shortened to <howl-demo.owl> 
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# The assembled HOWL file converted to N-Quads format:
# https://en.wikipedia.org/wiki/N-Triples#N-Quads
<http://example.com/howl-demo.owl> <http://www.w3.org/2000/01/rdf-schema#label> "Example Ontology" .
<http://example.com/howl-demo.owl> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#Ontology> .
<http://example.com/frog> <http://www.w3.org/2000/01/rdf-schema#label> "Frog" .
<http://example.com/frog> <http://purl.obolibrary.org/obo/IAO_0000115> "A circular definition of frog." .
<http://example.com/kermit> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example.com/frog> .
<http://example.com/french-fries> <http://www.w3.org/2000/01/rdf-schema#label> "French Fries"@en .
<http://example.com/french-fries> <http://www.w3.org/2000/01/rdf-schema#comment> "A comment string"^^<http://www.w4.org/2001/XMLSchema#string> .
<http://example.com/french-fries> <http://www.w3.org/2000/01/rdf-schema#label> "Frites"@fr .
<http://example.com/french-fries> <http://www.w3.org/2000/01/rdf-schema#comment> "1000"^^<http://www.w4.org/2001/XMLSchema#integer> .
<http://purl.obolibrary.org/obo/BFO_0000040> <http://www.w3.org/2000/01/rdf-schema#label> "material entity"@en .
<http://purl.obolibrary.org/obo/BFO_0000040> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#Class> .
<http://purl.obolibrary.org/obo/BFO_0000051> <http://www.w3.org/2000/01/rdf-schema#label> "has part"@en .
<http://purl.obolibrary.org/obo/BFO_0000051> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#ObjectProperty> .
<http://purl.obolibrary.org/obo/BFO_0000055> <http://www.w3.org/2000/01/rdf-schema#label> "realizes"@en .
<http://purl.obolibrary.org/obo/BFO_0000055> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#ObjectProperty> .
<http://purl.obolibrary.org/obo/IAO_0000030> <http://www.w3.org/2000/01/rdf-schema#label> "information content entity"@en .
<http://purl.obolibrary.org/obo/IAO_0000030> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#Class> .
<http://purl.obolibrary.org/obo/IAO_0000112> <http://www.w3.org/2000/01/rdf-schema#label> "example of usage"@en .
<http://purl.obolibrary.org/obo/IAO_0000112> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#AnnotationProperty> .
<http://purl.obolibrary.org/obo/IAO_0000115> <http://www.w3.org/2000/01/rdf-schema#label> "definition"@en .
<http://purl.obolibrary.org/obo/IAO_0000115> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#AnnotationProperty> .
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# The assembled HOWL file converted to Turtle format:
# https://en.wikipedia.org/wiki/Turtle_(syntax)
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix xsd: <http://www.w4.org/2001/XMLSchema#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix obo: <http://purl.obolibrary.org/obo/>.
@prefix ex: <http://example.com/>.
<http://example.com/howl-demo.owl> rdfs:label "Example Ontology";
    a owl:Ontology.
ex:frog rdfs:label "Frog";
    obo:IAO_0000115 "A circular definition of frog.".
ex:kermit a ex:frog.
ex:french-fries rdfs:label "French Fries"@en;
    rdfs:comment "A comment string"^^xsd:string;
    rdfs:label "Frites"@fr;
    rdfs:comment "1000"^^xsd:integer.
obo:BFO_0000040 rdfs:label "material entity"@en;
    a owl:Class.
obo:BFO_0000051 rdfs:label "has part"@en;
    a owl:ObjectProperty.
obo:BFO_0000055 rdfs:label "realizes"@en;
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https://github.com/ontodev/howl