Allow XML datetimes that do not include fractional seconds

[bbartley]

It appears that the validator requires that XML Datetimes include time in milliseconds. Hence, the following datetime is considered valid:

<prov:endedAtTime>2017-03-06T15:00:00.000+00:00</prov:endedAtTime>

While the following datetime is considered invalid, even though it is semantically equivalent as the one above:

<prov:endedAtTime>2017-03-06T15:00:00+00:00</prov:endedAtTime>

The Python datetime library omits fractional seconds by default, so it would be nice if SBOL-Validator permitted datetimes in this format.

Here are complete test files:

Invalid:

<rdf:RDF xmlns:brick="https://brickschema.org/schema/Brick#" xmlns:csvw="http://www.w3.org/ns/csvw#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcat="http://www.w3.org/ns/dcat#" xmlns:dcmitype="http://purl.org/dc/dcmitype/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dcam="http://purl.org/dc/dcam/" xmlns:doap="http://usefulinc.com/ns/doap#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:geo="http://www.opengis.net/ont/geosparql#" xmlns:odrl="http://www.w3.org/ns/odrl/2/" xmlns:org="http://www.w3.org/ns/org#" xmlns:prof="http://www.w3.org/ns/dx/prof/" xmlns:prov="http://www.w3.org/ns/prov#" xmlns:qb="http://purl.org/linked-data/cube#" xmlns:schema="https://schema.org/" xmlns:sh="http://www.w3.org/ns/shacl#" xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:sosa="http://www.w3.org/ns/sosa/" xmlns:ssn="http://www.w3.org/ns/ssn/" xmlns:time="http://www.w3.org/2006/time#" xmlns:vann="http://purl.org/vocab/vann/" xmlns:void="http://rdfs.org/ns/void#" xmlns:wgs="https://www.w3.org/2003/01/geo/wgs84_pos#" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" xmlns:sbol="http://sbols.org/v2#" xmlns:ns0="http://wiki.synbiohub.org/wiki/Terms/synbiohub#" xmlns:backport="http://sboltools.org/backport#">
  <prov:Activity rdf:about="https://synbiohub.org/public/igem/igem2sbol/1">
    <dcterms:title>iGEM to SBOL conversion</dcterms:title>
    <ns0:ownedBy rdf:resource="https://synbiohub.org/user/james"/>
    <prov:endedAtTime>2017-03-06T15:00:00+00:00</prov:endedAtTime>
    <dcterms:description>Conversion of the iGEM parts registry to SBOL2.1</dcterms:description>
    <backport:sbol3namespace rdf:resource="https://synbiohub.org"/>
    <sbol:displayId>igem2sbol</sbol:displayId>
    <ns0:topLevel rdf:resource="https://synbiohub.org/public/igem/igem2sbol"/>
    <sbol:version>1</sbol:version>
    <ns0:ownedBy rdf:resource="https://synbiohub.org/user/myers"/>
    <prov:wasDerivedFrom rdf:resource="https://synbiohub.org/public/igem/igem2sbol"/>
    <dc:creator>Chris J. Myers</dc:creator>
    <sbol:persistentIdentity rdf:resource="https://synbiohub.org/public/igem/igem2sbol"/>
    <dc:creator>James Alastair McLaughlin</dc:creator>
  </prov:Activity>
</rdf:RDF>

Valid:

<rdf:RDF xmlns:brick="https://brickschema.org/schema/Brick#" xmlns:csvw="http://www.w3.org/ns/csvw#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcat="http://www.w3.org/ns/dcat#" xmlns:dcmitype="http://purl.org/dc/dcmitype/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:dcam="http://purl.org/dc/dcam/" xmlns:doap="http://usefulinc.com/ns/doap#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:geo="http://www.opengis.net/ont/geosparql#" xmlns:odrl="http://www.w3.org/ns/odrl/2/" xmlns:org="http://www.w3.org/ns/org#" xmlns:prof="http://www.w3.org/ns/dx/prof/" xmlns:prov="http://www.w3.org/ns/prov#" xmlns:qb="http://purl.org/linked-data/cube#" xmlns:schema="https://schema.org/" xmlns:sh="http://www.w3.org/ns/shacl#" xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:sosa="http://www.w3.org/ns/sosa/" xmlns:ssn="http://www.w3.org/ns/ssn/" xmlns:time="http://www.w3.org/2006/time#" xmlns:vann="http://purl.org/vocab/vann/" xmlns:void="http://rdfs.org/ns/void#" xmlns:wgs="https://www.w3.org/2003/01/geo/wgs84_pos#" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" xmlns:backport="http://sboltools.org/backport#" xmlns:om="http://www.ontology-of-units-of-measure.org/resource/om-2/" xmlns:sbol="http://sbols.org/v2#" xmlns:ns0="http://wiki.synbiohub.org/wiki/Terms/synbiohub#" xmlns:ns2="http://wiki.synbiohub.org/wiki/Terms/igem#">
  <prov:Activity rdf:about="https://synbiohub.org/public/igem/igem2sbol">
    <dcterms:description>Conversion of the iGEM parts registry to SBOL2.1</dcterms:description>
    <dcterms:title>iGEM to SBOL conversion</dcterms:title>
    <prov:endedAtTime>2017-03-06T15:00:00.000+00:00</prov:endedAtTime>
    <backport:sbol3namespace rdf:resource="https://synbiohub.org"/>
    <sbol:displayId>igem2sbol</sbol:displayId>
    <dc:creator>Chris J. Myers</dc:creator>
    <sbol:version>1</sbol:version>
    <ns0:ownedBy rdf:resource="https://synbiohub.org/user/myers"/>
    <sbol:persistentIdentity rdf:resource="https://synbiohub.org/public/igem/igem2sbol"/>
    <dc:creator>James Alastair McLaughlin</dc:creator>
    <ns0:ownedBy rdf:resource="https://synbiohub.org/user/james"/>
    <ns0:topLevel rdf:resource="https://synbiohub.org/public/igem/igem2sbol"/>
  </prov:Activity>
</rdf:RDF>

[cjmyers]

We are using an ISO library to parse: ISODateTimeFormat

			DateTimeFormatter fmt = ISODateTimeFormat.dateTime();
			try {
				endedAtTime = fmt.parseDateTime(((Literal<QName>) namedProperty.getValue()).getValue().toString());
			} catch (IllegalArgumentException e) {
				throw new SBOLValidationException("sbol-12403", topLevel.getIdentity());
			}

Unless the library is wrong, I believe your format is not valid.