SPARQL for querying object property and its annotations - properties

Question

I am trying to learn about semantic web technology to see if it can replace the current Relational model in an application. I am using protege to design the ontology and Jena for the application which will be hosted on Apache TomEE.
I have created a simplified ontology to explain the query I am having. In people.owl (turtle below) there is only one class People. The object property hasChild links a person individual to his children who are also Person. Now I want to know the order of the children for a person.
For example, individual john has two children, with anne being first and jack being second. So to the hasChild object property of john I have added sequence annotation. The sequence is a number which tells the order in which the child was born for that person. So hasChild anne has sequence 1 and hasChild jack has sequnce 2. Similarly jane's hasChild jack has sequence 1.
The SPARQL I have to write is to get all the children of a given Person's name in the order they were born. So if I query children of "John Doe", I should get
|sequence | childname|
| 1 | Anne Doe |
| 2 | Jack Doe |
Below is the Ontology in turtle format.
#prefix : <http://www.semanticweb.org/abhishek/ontologies/people#> .
#prefix owl: <http://www.w3.org/2002/07/owl#> .
#prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
#prefix xml: <http://www.w3.org/XML/1998/namespace> .
#prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
#prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
#prefix people: <http://www.semanticweb.org/abhishek/ontologies/people#> .
#base <http://www.semanticweb.org/abhishek/ontologies/people> .
<http://www.semanticweb.org/abhishek/ontologies/people> rdf:type owl:Ontology .
### http://www.semanticweb.org/abhishek/ontologies/people#sequence
people:sequence rdf:type owl:AnnotationProperty .
### http://www.semanticweb.org/abhishek/ontologies/people#hasChild
people:hasChild rdf:type owl:ObjectProperty .
### http://www.semanticweb.org/abhishek/ontologies/people#hasParent
people:hasParent rdf:type owl:ObjectProperty .
### http://www.semanticweb.org/abhishek/ontologies/people#hasSpouse
people:hasSpouse rdf:type owl:ObjectProperty .
### http://www.semanticweb.org/abhishek/ontologies/people#name
people:name rdf:type owl:DatatypeProperty .
### http://www.semanticweb.org/abhishek/ontologies/people#Person
people:Person rdf:type owl:Class .
### http://www.semanticweb.org/abhishek/ontologies/people#anne
people:anne rdf:type owl:NamedIndividual ,
people:Person ;
people:name "Anne Doe"^^xsd:string .
### http://www.semanticweb.org/abhishek/ontologies/people#jack
people:jack rdf:type owl:NamedIndividual ,
people:Person ;
people:name "Jack Doe"^^xsd:string .
### http://www.semanticweb.org/abhishek/ontologies/people#jane
people:jane rdf:type owl:NamedIndividual ,
people:Person ;
people:hasChild people:jack ;
people:hasSpouse people:john ;
people:name "Jane Doe"^^xsd:string .
[ rdf:type owl:Axiom ;
owl:annotatedSource people:jane ;
owl:annotatedProperty people:hasChild ;
owl:annotatedTarget people:jack ;
people:sequence "1"^^xsd:int
] .
### http://www.semanticweb.org/abhishek/ontologies/people#john
people:john rdf:type owl:NamedIndividual ,
people:Person ;
people:hasChild people:anne ,
people:jack ;
people:hasSpouse people:jane ;
people:name "John Doe"^^xsd:string .
[ rdf:type owl:Axiom ;
owl:annotatedSource people:john ;
owl:annotatedProperty people:hasChild ;
owl:annotatedTarget people:anne ;
people:sequence "1"^^xsd:int
] .
[ rdf:type owl:Axiom ;
owl:annotatedSource people:john ;
owl:annotatedProperty people:hasChild ;
owl:annotatedTarget people:jack ;
people:sequence "2"^^xsd:int
] .
### Generated by the OWL API (version 4.2.6.20160910-2108) https://github.com/owlcs/owlapi
I have the query till now:
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX ppl: <http://www.semanticweb.org/abhishek/ontologies/people#>
SELECT ?sequence ?childname
WHERE { ?person rdf:type ppl:Person .
?person ppl:name ?name .
?person ppl:hasChild ?child .
#Get the ?sequence for the current child. sequence is annotated to hasChild.
?child ppl:name ?childname .
FILTER regex(?name, "John Doe") }
So I have two questions:
Should I change the ontology design to assign the sequence number to a child?
If the above approach is correct, how do I get the sequence for a child?
I posted the same question on Jena user list and got the recommendation to use RDF Collections. But from google search I found collections don't work with OWL (and hence Protege).
Thanks,
Abhishek

Answer 1

PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX ppl: <http://www.semanticweb.org/abhishek/ontologies/people#>
SELECT ?sequence ?childname
WHERE { ?person rdf:type ppl:Person .
?person ppl:name ?name .
?person ppl:hasChild ?child .
#Get the ?sequence for the current child. sequence is annotated to hasChild.
?child ppl:name ?childname .
?annotation owl:annotatedSource ?person ;
owl:annotatedTarget ?child ;
ppl:sequence ?sequence .
FILTER regex(?name, "John Doe") }