This document demonstrates some approaches to expressing RDF queries in XQuery. The examples include matilda and FA and contrast them with BRQL. The first examples demonstrate simple RDF queries in XQuery. The later FA queries motivate merging RDF data with data in other XML documents.
These are notes from a working group breakout. They have no standing in the W3C process.
Search for vcard information in BRQL:
SELECT ?family , ?given
WHERE (?vcard vcard:FN "Alice Antwerp")
(?vcard vcard:N ?name)
(?name vcard:Family ?family)
(?name vcard:Given ?given)
USING vcard FOR <http://www.w3.org/2001/vcard-rdf/3.0#>
or in Matilda:
DECLARE ELEMENT NAMESPACE vcard = <http://www.w3.org/2001/vcard-rdf/3.0#>
FOR $vcard IN rdfNodes(),
$name IN rdfNodes(),
$family IN rdfNodes(),
$given IN rdfNodes()
WHERE asserted($vcard vcard:FN "Alice Antwerp"),
AND asserted($vcard vcard:N $name),
AND asserted($name vcard:Family $family),
AND asserted($name vcard:Given $given)
RETURN <p>$family $given</p>
Use literal comparisons to select (in the relational algebra sense, σa⋝v(R)) in BRQL:
SELECT ?resource WHERE (?resource info:age ?age) AND ?age >= 24 USING info FOR <http://example.org/peopleInfo#>
or in Matilda:
DECLARE ELEMENT NAMESPACE info = <http://example.org/peopleInfo#> FOR $resource IN rdfNodes(), WHERE asserted($resource info:age $age) AND ?age >= 24 RETURN <foo>$resource</foo>
This is a quick start at an abstract algebra to represent the query functionality in BRQL that Matilda would need to match:
N is the set of RDF nodes. $ is the set of variables. Pos := N u $ C := Pos × Pos × Pos Cexp := field(C, AND, OR) ... c1 AND c2 , c1 OR c2 B := $ × '=' × N Bexp := field(B, AND, OR) f(c ∈ C) -> b ∈ Bexp
/var/utmp.xml has a set of records saying who's logged on and for how long.
<utmp>
<user>
<uid>1007</uid>
<username>Ann</username>
<logintime>23</logintime>
</user>
<user>
<uid>1003</uid>
<username>Bob</username>
<logintime>18</logintime>
</user>
</utmp>
<whoson>
{
for $record in doc('file://var/utmp.xml')/*/user
let $given := rdf:doc('http://example.org/foaf.rdf')/rdf-has-subject-predicate($record/username, foaf:given)
let $family := rdf:doc('http://example.org/foaf.rdf')/rdf-has-subject-predicate($record/username, foaf:family)
return
<tr><td>$record/username</td><td>$record/logintime</td><td>$given</td><td>$family</td></tr>
}</whoson>
Bust people for pretending to sell commodities to co-conspirators.
@@@ in progress @@@
<fiends>
{
for $seller in doc('edgar.xml')/service
for $buyer in $seller/to
let $theMan := rdf:doc('fatcat.rdf')/rdf-has-subject-predicate($seller/ceo, vcard:FN)
let $conspirator := rdf:doc('foaf.rdf')/rdf-has-subject-predicate($buyer/ceo, vcard:FN) AND
rdf:doc('foaf.rdf')/rdf-has-subject-predicate-object($seller/ceo, foaf:knows, $buyer/ceo)
return
<tr><td>$seller/name</td><td>$seller/price</td><td>$theMan</td><td>$conspirator</td></tr>
}</finds>
<?xml version="1.0"?>
<ownershipDocument>
<schemaVersion>X0202</schemaVersion>
<documentType>4</documentType>
<periodOfReport>2004-07-14</periodOfReport>
<notSubjectToSection16>0</notSubjectToSection16>
<issuer>
<issuerCik>0001095858</issuerCik>
<issuerName>IVAX DIAGNOSTICS INC</issuerName>
<issuerTradingSymbol>IVD</issuerTradingSymbol>
</issuer>
<reportingOwner>
<reportingOwnerId>
<rptOwnerCik>0001199347</rptOwnerCik>
<rptOwnerName>HARLEY JOHN</rptOwnerName>
</reportingOwnerId>
<reportingOwnerAddress>
<rptOwnerStreet1>2140 NORTH MIAMI AVENUE</rptOwnerStreet1>
<rptOwnerStreet2></rptOwnerStreet2>
<rptOwnerCity>MIAMI</rptOwnerCity>
<rptOwnerState>FL</rptOwnerState>
<rptOwnerZipCode>33127</rptOwnerZipCode>
<rptOwnerStateDescription></rptOwnerStateDescription>
</reportingOwnerAddress>
<reportingOwnerRelationship>
<isDirector>1</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
</reportingOwnerRelationship>
</reportingOwner>
<derivativeTable>
<derivativeTransaction>
<securityTitle>
<value>Stock Option (Right to Buy)</value>
</securityTitle>
<conversionOrExercisePrice>
<value>6.21</value>
</conversionOrExercisePrice>
<transactionDate>
<value>2004-07-14</value>
</transactionDate>
<transactionCoding>
<transactionFormType>4</transactionFormType>
<transactionCode>A</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved>
</transactionCoding>
<transactionAmounts>
<transactionShares>
<value>15000</value>
</transactionShares>
<transactionPricePerShare>
<value>0</value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value>A</value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<exerciseDate>
<value>2004-07-14</value>
</exerciseDate>
<expirationDate>
<value>2011-07-13</value>
</expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>Common Stock, par value $0.01</value>
</underlyingSecurityTitle>
<underlyingSecurityShares>
<value>15000</value>
</underlyingSecurityShares>
</underlyingSecurity>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>15000</value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value>
</directOrIndirectOwnership>
</ownershipNature>
</derivativeTransaction>
</derivativeTable>
<ownerSignature>
<signatureName>/s/ John B. Harley</signatureName>
<signatureDate>2004-07-14</signatureDate>
</ownerSignature>
</ownershipDocument>
link to the FOAF Fatcat Data