Please review these helpful references:
Valid RDF triples can be stored in any graph databases.
Example of MarkLogic supported RDF XML data model:
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:spi="http://my.semantics/projects/incentive/"
xmlns:sbase="http://my.semantics/projects/"
xmlns:onto="http://my.semantics/projects/ontology/"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
<rdf:Description rdf:about="http://my.semantics/projects/incentive/123859"
sbase:program="Economic Development Fund"
sbase:projectID="123859"
sbase:projectName="ABC, Inc Innovation Cluster "
sbase:recipient="ABC, Inc">
<sbase:about rdf:resource="http://my.semantics/ontology/economy"/>
<spi:postalCode>60311</spi:postalCode>
<spi:region>G13</spi:region>
<spi:industry>Scientific, and Technical Services</spi:industry>
<spi:incentiveType>Grant and Credit</spi:incentiveType>
<spi:startDate rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2021-08-17T00:00:00</spi:startDate>
<spi:totalAwarded rdf:datatype="http://www.w3.org/2001/XMLSchema#decimal">13,315,259</spi:totalAwarded>
<spi:totalInvestment rdf:datatype="http://www.w3.org/2001/XMLSchema#decimal">175,991,971</spi:totalInvestment>
<spi:disbursementsToDate rdf:datatype="http://www.w3.org/2001/XMLSchema#decimal">7,000,000</spi:disbursementsToDate>
<rdfs:comment xml:lang="en">Grant and Credit; Scientific, and Technical Services;G13; ABC, Inc </rdfs:comment>
</rdf:Description>
</rdf:RDF>
Once the RDF data model is correctly constructed, the triples transformation is straightforward.
Transformed and ingested MarkLogic triples based on above model:
<?xml version="1.0" encoding="UTF-8"?>
<sem:triples xmlns:sem="http://marklogic.com/semantics">
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/program</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#string">Economic Development Fund</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/projectID</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#string">123859</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/projectName</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#string">ABC, Inc Innovation Cluster</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/recipient</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#string">ABC, Inc</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/about</sem:predicate>
<sem:object>http://my.semantics/ontology/economy</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/incentive/postalCode</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#string">60311</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/incentive/region</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#string">G13</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/incentive/industry</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#string">Scientific, and Technical Services</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/incentive/incentiveType</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#string">Grant and Credit</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/incentive/startDate</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#dateTime">2021-08-17T00:00:00</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/incentive/totalAwarded</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#decimal">13,315,259</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/incentive/totalInvestment</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#decimal">175,991,971</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://my.semantics/projects/incentive/disbursementsToDate</sem:predicate>
<sem:object datatype="http://www.w3.org/2001/XMLSchema#decimal">7,000,000</sem:object>
</sem:triple>
<sem:triple>
<sem:subject>http://my.semantics/projects/incentive/123859</sem:subject>
<sem:predicate>http://www.w3.org/2000/01/rdf-schema#comment</sem:predicate>
<sem:object xml:lang="en">Grant and Credit; Scientific, and Technical Services;G13; ABC, Inc</sem:object>
</sem:triple>
</sem:triples>