Conversion from SBOL2 to SBOL3 creates files with validation errors.
For example, here are the errors from conversion of this short J23101 XML file:
<?xml version="1.0" encoding="UTF-8"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:prov="http://www.w3.org/ns/prov#" xmlns:sbol="http://sbols.org/v2#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#dateTime/" xmlns:om="http://www.ontology-of-units-of-measure.org/resource/om-2/" xmlns:synbiohub="http://synbiohub.org#" xmlns:sbh="http://wiki.synbiohub.org/wiki/Terms/synbiohub#" xmlns:sybio="http://www.sybio.ncl.ac.uk#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:ncbi="http://www.ncbi.nlm.nih.gov#" xmlns:igem="http://wiki.synbiohub.org/wiki/Terms/igem#" xmlns:genbank="http://www.ncbi.nlm.nih.gov/genbank#" xmlns:gbconv="http://sbols.org/genBankConversion#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:obo="http://purl.obolibrary.org/obo/">
<sbol:ComponentDefinition rdf:about="https://synbiohub.org/public/igem/BBa_J23101/1">
<sbol:persistentIdentity rdf:resource="https://synbiohub.org/public/igem/BBa_J23101"/>
<sbol:displayId>BBa_J23101</sbol:displayId>
<sbol:version>1</sbol:version>
<prov:wasDerivedFrom rdf:resource="http://parts.igem.org/Part:BBa_J23101"/>
<prov:wasGeneratedBy rdf:resource="https://synbiohub.org/public/igem/igem2sbol/1"/>
<dcterms:title>BBa_J23101</dcterms:title>
<dcterms:description>constitutive promoter family member</dcterms:description>
<dcterms:created>2006-08-03T11:00:00Z</dcterms:created>
<dcterms:modified>2015-08-31T04:08:40Z</dcterms:modified>
<sbh:mutableProvenance>later</sbh:mutableProvenance>
<sbh:topLevel rdf:resource="https://synbiohub.org/public/igem/BBa_J23101/1"/>
<sbh:ownedBy rdf:resource="https://synbiohub.org/user/james"/>
<sbh:ownedBy rdf:resource="https://synbiohub.org/user/myers"/>
<igem:partStatus>Released HQ 2013</igem:partStatus>
<sbh:mutableDescription>later</sbh:mutableDescription>
<igem:discontinued>false</igem:discontinued>
<igem:dominant>true</igem:dominant>
<igem:experience rdf:resource="http://wiki.synbiohub.org/wiki/Terms/igem#experience/Works"/>
<igem:group_u_list>_52_</igem:group_u_list>
<igem:m_user_id>0</igem:m_user_id>
<igem:owner_id>483</igem:owner_id>
<igem:owning_group_id>95</igem:owning_group_id>
<igem:sampleStatus>In stock</igem:sampleStatus>
<igem:status rdf:resource="http://wiki.synbiohub.org/wiki/Terms/igem#status/Available"/>
<sbh:bookmark>true</sbh:bookmark>
<sbh:mutableNotes>N/A</sbh:mutableNotes>
<sbh:star>true</sbh:star>
<dc:creator>John Anderson</dc:creator>
<sbol:type rdf:resource="http://www.biopax.org/release/biopax-level3.owl#DnaRegion"/>
<sbol:role rdf:resource="http://wiki.synbiohub.org/wiki/Terms/igem#partType/Regulatory"/>
<sbol:role rdf:resource="http://identifiers.org/so/SO:0000167"/>
<sbol:sequence rdf:resource="https://synbiohub.org/public/igem/BBa_J23101_sequence/1"/>
</sbol:ComponentDefinition>
<sbol:Sequence rdf:about="https://synbiohub.org/public/igem/BBa_J23101_sequence/1">
<sbol:persistentIdentity rdf:resource="https://synbiohub.org/public/igem/BBa_J23101_sequence"/>
<sbol:displayId>BBa_J23101_sequence</sbol:displayId>
<sbol:version>1</sbol:version>
<prov:wasDerivedFrom rdf:resource="http://parts.igem.org/Part:BBa_J23101"/>
<prov:wasGeneratedBy rdf:resource="https://synbiohub.org/public/igem/igem2sbol/1"/>
<sbh:topLevel rdf:resource="https://synbiohub.org/public/igem/BBa_J23101_sequence/1"/>
<sbh:ownedBy rdf:resource="https://synbiohub.org/user/james"/>
<sbh:ownedBy rdf:resource="https://synbiohub.org/user/myers"/>
<sbol:elements>tttacagctagctcagtcctaggtattatgctagc</sbol:elements>
<sbol:encoding rdf:resource="http://www.chem.qmul.ac.uk/iubmb/misc/naseq.html"/>
</sbol:Sequence>
<prov:Activity rdf:about="https://synbiohub.org/public/igem/igem2sbol/1">
<sbol:persistentIdentity rdf:resource="https://synbiohub.org/public/igem/igem2sbol"/>
<sbol:displayId>igem2sbol</sbol:displayId>
<sbol:version>1</sbol:version>
<dcterms:title>iGEM to SBOL conversion</dcterms:title>
<dcterms:description>Conversion of the iGEM parts registry to SBOL2.1</dcterms:description>
<sbh:topLevel rdf:resource="https://synbiohub.org/public/igem/igem2sbol/1"/>
<sbh:ownedBy rdf:resource="https://synbiohub.org/user/james"/>
<sbh:ownedBy rdf:resource="https://synbiohub.org/user/myers"/>
<dc:creator>Chris J. Myers</dc:creator>
<dc:creator>James Alastair McLaughlin</dc:creator>
<prov:endedAtTime rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2017-03-06T15:00:00.000Z</prov:endedAtTime>
</prov:Activity>
</rdf:RDF>
https://synbiohub.org/public/igem/BBa_J23101_sequence: Too few values for property namespace. Expected 1, found 0
https://synbiohub.org/public/igem/BBa_J23101: Too few values for property namespace. Expected 1, found 0
https://synbiohub.org/public/igem/BBa_J23101_sequence: Less than 1 values on <https://synbiohub.org/public/igem/BBa_J23101_sequence>->:hasNamespace
https://synbiohub.org/public/igem/igem2sbol/1: Value does not have class :Identified
https://synbiohub.org/public/igem/BBa_J23101: Less than 1 values on <https://synbiohub.org/public/igem/BBa_J23101>->:hasNamespace
https://synbiohub.org/public/igem/BBa_J23101: Less than 1 values on <https://synbiohub.org/public/igem/BBa_J23101>->:hasNamespace
https://synbiohub.org/public/igem/BBa_J23101_sequence: Less than 1 values on <https://synbiohub.org/public/igem/BBa_J23101_sequence>->:hasNamespace
https://synbiohub.org/public/igem/BBa_J23101_sequence sbol3-10505: Sequence encoding is not in the recommended set
Conversion from SBOL2 to SBOL3 creates files with validation errors.
For example, here are the errors from conversion of this short J23101 XML file: