Error while registering a schema

Question

Hi :
I get this error while I am registering my XML schema.
ERROR at line 1:
ORA-31154: invalid XML document
ORA-19202: Error occurred in XML processing
LPX-00217: invalid character 0 (\u0000)
ORA-06512: at "XDB.DBMS_XMLSCHEMA_INT", line 0
ORA-06512: at "XDB.DBMS_XMLSCHEMA", line 26
ORA-06512: at line 2
I have marked in bold the part of the schema which bombs while registering. (When I validate this scehms in XML Spy it says it is a valid schems)
The Schema definition is as follows :
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="urn:uk:ac:ebi:spml" xmlns="urn:uk:ac:ebi:spml" xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified">
<xs:include schemaLocation="feature.xsd"/>
<!-- Evidence definition begins -->
<xs:complexType name="evidenceListType">
<xs:annotation>
<xs:documentation>The list of all evidences stored in one entry.</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="evidence" type="evidenceType" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="evidenceType">
<xs:annotation>
<xs:documentation>The evidence element is equivalent to the actual evidence (**EV line).</xs:documentation>
</xs:annotation>
<xs:attribute name="category" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="curator"/>
<xs:enumeration value="import"/>
<xs:enumeration value="program"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="ANU-2DPAGE_ADD"/>
<xs:enumeration value="COMPLUYEAST-2DPAGE_ADD"/>
<xs:enumeration value="Curator"/>
<xs:enumeration value="EMBL"/>
<xs:enumeration value="Experimental"/>
<xs:enumeration value="FLYBASE_ADD"/>
<xs:enumeration value="GENEW_ADD"/>
<xs:enumeration value="GOA_ADD"/>
<xs:enumeration value="GRAMENE_ADD"/>
<xs:enumeration value="HSSP_ADD"/>
<xs:enumeration value="Import"/>
<xs:enumeration value="MEROPS_ADD"/>
<xs:enumeration value="MGD_ADD"/>
<xs:enumeration value="Opinion"/>
<xs:enumeration value="PHCI-2DPAGE_ADD"/>
<xs:enumeration value="PMMA-2DPAGE_ADD"/>
<xs:enumeration value="ProtImp"/>
<xs:enumeration value="REBASE_ADD"/>
<xs:enumeration value="Rulebase"/>
<xs:enumeration value="SGD_ADD"/>
<xs:enumeration value="SIENA-2DPAGE_ADD"/>
<xs:enumeration value="SignalP"/>
<xs:enumeration value="Similarity"/>
<xs:enumeration value="TRANSFAC_ADD"/>
<xs:enumeration value="TrEMBL"/>
<xs:enumeration value="ZFIN_ADD"/>
<xs:enumeration value="internal"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="attribute" type="xs:string" use="optional"/>
<xs:attribute name="date" type="xs:date" use="required"/>
<xs:attribute name="evID" type="xs:string" use="required"/>
</xs:complexType>
<!-- Evidence definition ends -->
<!-- Definition of the protein begins -->
<xs:complexType name="proteinType">
<xs:sequence>
<xs:element name="name" type="nameType" maxOccurs="unbounded"/>
<xs:element name="iRefList" type="iRefListType" minOccurs="0">
<xs:annotation>
<xs:documentation>This is referring to a possible EC number (ENZYME database cross reference).</xs:documentation>
</xs:annotation>
</xs:element>
<xs:choice minOccurs="0">
<xs:element name="componentList">
<xs:annotation>
<xs:documentation>The component list is equivalent to the CONTAINS section of the DE line.</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element name="component" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="nameType" maxOccurs="unbounded"/>
<xs:element name="iRefList" type="iRefListType" minOccurs="0">
<xs:annotation>
<xs:documentation>This is referring to a possible EC number (ENZYME database cross reference).</xs:documentation>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="domainList">
<xs:annotation>
<xs:documentation>The domain list is equivalent to the INCLUDES section of the DE line.</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element name="domain" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="nameType" maxOccurs="unbounded"/>
<xs:element name="iRefList" type="iRefListType" minOccurs="0">
<xs:annotation>
<xs:documentation>This is referring to a possible EC number (ENZYME database cross reference).</xs:documentation>
</xs:annotation>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:choice>
<xs:element name="evList" type="evListType" minOccurs="0">
<xs:annotation>
<xs:documentation>This contains all evidence that are connected to the complete DE line (For the time being also the ones that couldn't be resolved to a single name).</xs:documentation>
</xs:annotation>
</xs:element>
</xs:sequence>
<xs:attribute name="evidenceStatus">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="hypothetical"/>
<xs:enumeration value="putative"/>
<xs:enumeration value="possible"/>
<xs:enumeration value="probable"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="type">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="fragment"/>
<xs:enumeration value="fragments"/>
<xs:enumeration value="version1"/>
<xs:enumeration value="version2"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
<!-- Definition of the protein ends -->
<!-- DB reference definition begins -->
<xs:complexType name="sptrProperties">
<xs:complexContent>
<xs:restriction base="propertyBaseType">
<xs:attribute name="name" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="edition"/>
<xs:enumeration value="entry name"/>
<xs:enumeration value="evidence"/>
<xs:enumeration value="gene designation"/>
<xs:enumeration value="last revision date"/>
<xs:enumeration value="match status"/>
<xs:enumeration value="match status hits"/>
<xs:enumeration value="method"/>
<xs:enumeration value="organism name"/>
<xs:enumeration value="pdb accession"/>
<xs:enumeration value="protein sequence ID"/>
<xs:enumeration value="status"/>
<xs:enumeration value="term"/>
<xs:enumeration value="type"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="value" type="xs:string" use="required"/>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:simpleType name="allSPTrDbsType">
<xs:restriction base="xs:string">
<xs:enumeration value="ANU-2DPAGE"/>
<xs:enumeration value="Aarhus/Ghent-2DPAGE"/>
<xs:enumeration value="COMPLUYEAST-2DPAGE"/>
<xs:enumeration value="DictyDb"/>
<xs:enumeration value="EC"/>
<xs:enumeration value="ECO2DBASE"/>
<xs:enumeration value="EMBL"/>
<xs:enumeration value="EcoGene"/>
<xs:enumeration value="FlyBase"/>
<xs:enumeration value="GO"/>
<xs:enumeration value="Genew"/>
<xs:enumeration value="GlycoSuiteDB"/>
<xs:enumeration value="Gramene"/>
<xs:enumeration value="HIV"/>
<xs:enumeration value="HSC-2DPAGE"/>
<xs:enumeration value="HSSP"/>
<xs:enumeration value="InterPro"/>
<xs:enumeration value="Leproma"/>
<xs:enumeration value="ListiList"/>
<xs:enumeration value="MAIZE-2DPAGE"/>
<xs:enumeration value="MEROPS"/>
<xs:enumeration value="MGD"/>
<xs:enumeration value="MIM"/>
<xs:enumeration value="MaizeDB"/>
<xs:enumeration value="MypuList"/>
<xs:enumeration value="PDB"/>
<xs:enumeration value="PHCI-2DPAGE"/>
<xs:enumeration value="PhosSite"/>
<xs:enumeration value="PIR"/>
<xs:enumeration value="PMMA-2DPAGE"/>
<xs:enumeration value="PRINTS"/>
<xs:enumeration value="PROSITE"/>
<xs:enumeration value="Pfam"/>
<xs:enumeration value="ProDom"/>
<xs:enumeration value="REBASE"/>
<xs:enumeration value="SGD"/>
<xs:enumeration value="SMART"/>
<xs:enumeration value="SWISS-2DPAGE"/>
<xs:enumeration value="Siena-2DPAGE"/>
<xs:enumeration value="StyGene"/>
<xs:enumeration value="SubtiList"/>
<xs:enumeration value="TIGR"/>
<xs:enumeration value="TIGRFAMs"/>
<xs:enumeration value="TRANSFAC"/>
<xs:enumeration value="TubercuList"/>
<xs:enumeration value="WormPep"/>
<xs:enumeration value="ZFIN"/>
</xs:restriction>
</xs:simpleType>
<!-- <xs:complexType name="sptrDbReferenceType" abstract="true">-->
<xs:complexType name="sptrDbReferenceType">
<xs:complexContent>
<xs:restriction base="dbReferenceBaseType">
<xs:sequence>
<xs:element name="property" type="propertyBaseType" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="db" type="allSPTrDbsType" use="required"/>
<xs:attribute name="id" type="xs:string" use="required"/>
<xs:attribute name="iRefID" type="xs:string" use="required"/>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<!-- EMBL -->
<!--
<xs:complexType name="emblDbProperties">
<xs:complexContent>
<xs:restriction base="propertyBaseType">
<xs:attribute name="name" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="protein sequence ID"/>
<xs:enumeration value="status"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="value" type="xs:string" use="required"/>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="emblDbReferenceType">
<xs:complexContent>
<xs:restriction base="sptrDbReferenceType">
<xs:sequence>
<xs:element name="property" type="emblDbProperties" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="db" use="required">
<xs:simpleType>
<xs:restriction base="allSPTrDbsType">
<xs:enumeration value="EMBL"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="id" type="xs:string" use="required"/>
<xs:attribute name="iRefID" type="xs:string" use="required"/>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
-->
<!-- EMBL -->
<!-- NCBI Taxonomy -->
<xs:complexType name="taxonomyDBType">
<xs:annotation>
<xs:documentation>This dbRef type is meant for taxonomy database such as the NCBI taxonomy database.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:restriction base="dbReferenceBaseType">
<xs:sequence>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="db" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="NCBI Taxonomy"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="id" type="xs:string" use="required"/>
<xs:attribute name="iRefID" type="xs:string" use="required"/>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<!-- NCBI Taxonomy -->
<!-- DB reference definition ends -->
<!-- Name definition begins -->
<xs:complexType name="nameType" mixed="true">
<xs:annotation>
<xs:documentation>The name type is used for all names occuring in an entry.</xs:documentation>
</xs:annotation>
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="organismNameType">
<xs:annotation>
<xs:documentation>The name type is used for source organism names.</xs:documentation>
</xs:annotation>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="common name"/>
<xs:enumeration value="full name"/>
<xs:enumeration value="scientific name"/>
<xs:enumeration value="synonym"/>
<xs:enumeration value="abbreviation"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<!-- Name definition ends -->
<!-- Definition of the geneLocation begins -->
<xs:complexType name="geneLocationListType">
<xs:annotation>
<xs:documentation>Defines the locations/origins of the shown sequence (OG line).</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="geneLocation" type="geneLocationBaseType" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="geneLocationBaseType" abstract="true">
<xs:annotation>
<xs:documentation>The location's supertype.</xs:documentation>
</xs:annotation>
</xs:complexType>
<xs:complexType name="organelleLocationType">
<xs:annotation>
<xs:documentation>This type stores the location if it's a chloroplast, cyanelle or mitochondrium.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="geneLocationBaseType">
<xs:sequence>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="chloroplast"/>
<xs:enumeration value="cyanelle"/>
<xs:enumeration value="mitochondrion"/>
<xs:enumeration value="nucleomorph"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="plasmidLocationType">
<xs:annotation>
<xs:documentation>This type stores the location if it's a plasmid including all plasmid names.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="geneLocationBaseType">
<xs:sequence>
<xs:element name="name" type="nameType"/>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="plasmid"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<!-- Definition of the geneLocation ends -->
<!-- Feature definition begins -->
<xs:complexType name="baseFeatureType" mixed="true">
<xs:annotation>
<xs:documentation>The feature's supertype from which all other feature element types are derived.</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:group ref="locationGroup" minOccurs="0"/>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="description" type="xs:string" use="optional"/>
</xs:complexType>
<xs:complexType name="featureType" mixed="true">
<xs:annotation>
<xs:documentation>Currently there is only one basic feature type, but this will change in future with enhancement of the FT line parsers.</xs:documentation>
</xs:annotation>
<xs:complexContent mixed="true">
<xs:extension base="baseFeatureType">
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="active site"/>
<xs:enumeration value="binding site"/>
<xs:enumeration value="calcium-binding region"/>
<xs:enumeration value="glycosylation site"/>
<xs:enumeration value="chain"/>
<xs:enumeration value="sequence conflict"/>
<xs:enumeration value="disulfide bond"/>
<xs:enumeration value="DNA-binding region"/>
<xs:enumeration value="domain"/>
<xs:enumeration value="helix"/>
<xs:enumeration value="initiator methionine"/>
<xs:enumeration value="lipid moiety-binding region"/>
<xs:enumeration value="metal ion-binding site"/>
<xs:enumeration value="modified residue"/>
<xs:enumeration value="mutagenesis site"/>
<xs:enumeration value="non-consecutive residues"/>
<xs:enumeration value="non-terminal residue"/>
<xs:enumeration value="nucleotide phosphate-binding region"/>
<xs:enumeration value="peptide"/>
<xs:enumeration value="propeptide"/>
<xs:enumeration value="repeat"/>
<xs:enumeration value="selenocysteine"/>
<xs:enumeration value="signal peptide"/>
<xs:enumeration value="site"/>
<xs:enumeration value="strand"/>
<xs:enumeration value="thioether bond"/>
<xs:enumeration value="thiolester bond"/>
<xs:enumeration value="transit peptide"/>
<xs:enumeration value="transmembrane region"/>
<xs:enumeration value="turn"/>
<xs:enumeration value="unsure residue"/>
<xs:enumeration value="sequence variant"/>
<xs:enumeration value="splice variant"/>
<xs:enumeration value="zinc finger region"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<!-- Feature definition ends -->
<!-- Comment definition begins -->
<xs:complexType name="baseCommentType" abstract="true" mixed="true">
<xs:annotation>
<xs:documentation>The comment's supertype from which all other comment element types are derived</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="commentType" mixed="true">
<xs:annotation>
<xs:documentation>Basic comment type which contains only text and evidence tags, no extra structure/attributes.</xs:documentation>
</xs:annotation>
<xs:complexContent mixed="true">
<xs:extension base="baseCommentType">
<xs:attribute name="topic" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="alternative products"/>
<xs:enumeration value="biotechnology"/>
<xs:enumeration value="catalytic activity"/>
<xs:enumeration value="caution"/>
<xs:enumeration value="cofactor"/>
<xs:enumeration value="database"/>
<xs:enumeration value="developmental stage"/>
<xs:enumeration value="disease"/>
<xs:enumeration value="domain"/>
<xs:enumeration value="enzyme regulation"/>
<xs:enumeration value="function"/>
<xs:enumeration value="induction"/>
<xs:enumeration value="miscellaneous"/>
<xs:enumeration value="pathway"/>
<xs:enumeration value="pharmaceutical"/>
<xs:enumeration value="polymorphism"/>
<xs:enumeration value="ptm"/>
<xs:enumeration value="similarity"/>
<xs:enumeration value="subcellular location"/>
<xs:enumeration value="subunit"/>
<xs:enumeration value="tissue specificity"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<!--
<xs:complexType name="commentDatabaseType" mixed="true">
<xs:complexContent mixed="true">
<xs:extension base="baseCommentType">
<xs:attribute name="topic" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="database"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="note" type="xs:string" use="optional"/>
<xs:attribute name="www" type="xs:anyURI" use="optional"/>
<xs:attribute name="ftp" type="xs:anyURI" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
-->
<xs:complexType name="massSpecType" mixed="true">
<xs:annotation>
<xs:documentation>The information of the mass spectrometry comment is stored in the attributes:
-molWeight (molecular weight)
-mwError (error of the molecular weight)
-msMethod (the method used for the mass spectrometry)
-range (which amino acids were messured. It's not mentioned if the complete sequence as shown in the entry was messured)</xs:documentation>
</xs:annotation>
<xs:complexContent mixed="true">
<xs:extension base="baseCommentType">
<xs:sequence minOccurs="0">
<xs:element name="range" minOccurs="0" maxOccurs="unbounded">
<xs:complexType>
<xs:attribute name="begin" type="xs:int" use="required"/>
<xs:attribute name="end" type="xs:int" use="required"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="topic" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="mass spectrometry"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="molWeight" type="xs:float" use="required"/>
<xs:attribute name="mwError" type="xs:string" use="optional"/>
<xs:attribute name="msMethod" type="xs:string" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<!-- Comment definition ends -->
<!-- Citation type section begins -->
<!-- Definitions for SPTr's additional citation information begins -->
<xs:complexType name="scopeListType">
<xs:annotation>
<xs:documentation>Contains a list of scopes regarding a citation. There is no classification currently, but will be introduced in future. (RP lines).</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="scope" type="xs:string" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="sourceDataType">
<xs:annotation>
<xs:documentation>Contains specific information about the sequence source that was used in the ciation (RC lines).</xs:documentation>
</xs:annotation>
<xs:choice maxOccurs="unbounded">
<xs:element name="species">
<xs:complexType>
<xs:sequence>
<xs:element name="iRefList" type="iRefListType"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="strain">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="plasmid" type="xs:string"/>
<xs:element name="transposon" type="xs:string"/>
<xs:element name="tissue" type="xs:string"/>
</xs:choice>
</xs:complexType>
<xs:group name="sptrCitationGroup">
<xs:annotation>
<xs:documentation>Groups the scope and source data lists.</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="scopeList" type="scopeListType"/>
<xs:element name="source" type="sourceDataType" minOccurs="0"/>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
</xs:group>
<!-- Definitions for SPTr's additional citation information ends -->
<xs:complexType name="referenceType">
<xs:annotation>
<xs:documentation>Stores all information of the reference block in SPTr (RN, RP, RC, RX, RA, RT and RL line).</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="citation" type="citationType"/>
<xs:group ref="sptrCitationGroup"/>
</xs:sequence>
<xs:attribute name="iRefID" type="xs:string" use="required"/>
</xs:complexType>
<!-- Citation type section ends -->
<!-- Entry type definition begins -->
<xs:complexType name="entryType">
<xs:annotation>
<xs:documentation>A (public) SPTr entry</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="secondaryAccessionList" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="accession" type="xs:string" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="secondaryNameList" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="xs:string" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="protein" type="proteinType"/>
<xs:element name="geneList" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="gene" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="nameType" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="organismList">
<xs:complexType>
<xs:sequence>
<xs:element name="organism" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="name" type="organismNameType" maxOccurs="unbounded"/>
<xs:element name="dbReferenceList">
<xs:complexType>
<xs:sequence>
<xs:element name="dbReference" type="taxonomyDBType" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="lineage" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="taxon" type="xs:string" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="iRefID" type="xs:string" use="optional"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="geneLocationList" type="geneLocationListType" minOccurs="0"/>
<xs:element name="referenceList">
<xs:complexType>
<xs:choice maxOccurs="unbounded">
<xs:element name="reference" type="referenceType"/>
</xs:choice>
</xs:complexType>
</xs:element>
<xs:element name="commentList" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="comment" type="baseCommentType" nillable="true" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="dbReferenceList" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="dbReference" type="sptrDbReferenceType" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="keywordList" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="keyword" maxOccurs="unbounded">
<xs:complexType mixed="true">
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="evList" type="evListType"/>
</xs:choice>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="featureList" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="feature" type="featureType" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="evidenceList" type="evidenceListType" minOccurs="0"/>
<xs:element name="sequence">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="length" type="xs:integer" use="required"/>
<xs:attribute name="weight" type="xs:integer" use="required"/>
<xs:attribute name="crc64" type="xs:string" use="required"/>
<xs:attribute name="lastUpdate" type="xs:date" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="accession" type="xs:string" use="required"/>
<xs:attribute name="database" type="xs:string" use="required"/>
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="firstPublic" type="xs:date" use="required"/>
<xs:attribute name="lastAnnotationUpdate" type="xs:date" use="required"/>
</xs:complexType>
<!-- Entry type definition ends -->
<!-- Definition of the content of the root element "swissprot" -->
<xs:element name="sptr">
<xs:annotation>
<xs:documentation>Contains a collection of Swiss-Prot entries.</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element name="entry" type="entryType" maxOccurs="unbounded">
<xs:key name="referenceKey">
<xs:annotation>
<xs:documentation>Defines the key constraint for iRefID attribute where possible in the entry (citations are missing still).</xs:documentation>
</xs:annotation>
<xs:selector xpath="organismList/organism|dbReferenceList/dbReference"/>
<xs:field xpath="iRefID"/>
</xs:key>
<xs:key name="evidenceReferenceKey">
<xs:annotation>
<xs:documentation>Defines the key constraint for evID attribute in evidence elements.</xs:documentation>
</xs:annotation>
<xs:selector xpath="evidenceList/evidence"/>
<xs:field xpath="evID"/>
</xs:key>
<!--
<xs:keyref name="internalReference" refer="referenceKey">
<xs:selector xpath=".//iRef"/>
<xs:field xpath="ref"/>
</xs:keyref>
-->
<xs:keyref name="evidenceReference" refer="evidenceReferenceKey">
<xs:selector xpath=".//ev"/>
<xs:field xpath="ref"/>
</xs:keyref> <!--
-->
</xs:element>
<xs:element name="copyright">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="iRefID" type="xs:string" use="required"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
feature.xsd is below :
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="urn:uk:ac:ebi:spml" xmlns="urn:uk:ac:ebi:spml" xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
<!-- Feature location definition begins -->
<xs:complexType name="positionType">
<xs:attribute name="position" type="xs:unsignedLong" use="required"/>
</xs:complexType>
<xs:complexType name="gapType">
<xs:complexContent>
<xs:extension base="positionType">
<xs:attribute name="length" type="xs:unsignedLong" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="intervalType">
<xs:attribute name="begin" type="xs:unsignedLong" use="required"/>
<xs:attribute name="end" type="xs:unsignedLong" use="required"/>
</xs:complexType>
<xs:complexType name="baseLocationType">
<xs:annotation>
<xs:documentation>A location can be either a position, site or have a start and end, only start, only end or is an empty element if the position is unknown.
The iRef attribute points to an external database reference (equivalent to J00194:100..202 in EMBL).</xs:documentation>
</xs:annotation>
<xs:choice>
<xs:sequence>
<xs:choice minOccurs="0">
<xs:element name="begin" type="positionType"/>
<xs:element name="beginInterval" type="intervalType"/>
</xs:choice>
<xs:choice minOccurs="0">
<xs:element name="end" type="positionType"/>
<xs:element name="endInterval" type="intervalType"/>
</xs:choice>
</xs:sequence>
<xs:element name="position" type="positionType"/>
<xs:element name="positionInterval" type="intervalType"/>
<xs:element name="site" type="positionType"/>
</xs:choice>
<xs:attribute name="iRef" type="xs:string" use="optional"/>
<xs:attribute name="complement" type="xs:boolean" use="optional" default="false"/>
</xs:complexType>
<xs:complexType name="fuzzyLocationType">
<xs:annotation>
<xs:documentation>A location can be either a position, site or have a start and end, only start, only end or is an empty element if the position is unknown.
The iRef attribute points to an external database reference (equivalent to J00194:100..202 in EMBL).</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="baseLocationType">
<xs:attribute name="fuzzy" use="optional" default="none">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="left"/>
<xs:enumeration value="right"/>
<xs:enumeration value="both"/>
<xs:enumeration value="none"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="joinType">
<xs:sequence>
<xs:choice maxOccurs="unbounded">
<xs:element name="location" type="baseLocationType"/>
<xs:element name="gap" type="gapType"/>
</xs:choice>
</xs:sequence>
<xs:attribute name="fuzzy" use="optional" default="none">
<xs:simpleType>
<xs:restriction base="xs:NMTOKEN">
<xs:enumeration value="left"/>
<xs:enumeration value="right"/>
<xs:enumeration value="both"/>
<xs:enumeration value="none"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="complement" type="xs:boolean" use="optional" default="false"/>
</xs:complexType>
<xs:group name="locationGroup">
<xs:choice>
<xs:element name="location" type="fuzzyLocationType"/>
<xs:element name="join" type="joinType"/>
</xs:choice>
</xs:group>
<!-- Feature location definition ends -->
<!-- Evidence definition begins -->
<xs:complexType name="evListType">
<xs:annotation>
<xs:documentation>Contains a list of evidence tags.</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="ev" maxOccurs="unbounded">
<xs:annotation>
<xs:documentation>The ev element is equivalent to an evidence tags.</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:attribute name="ref" type="xs:string" use="required"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<!-- Evidence definition ends -->
<!-- DB reference definition begins -->
<xs:complexType name="propertyBaseType">
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="value" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="dbReferenceBaseType" abstract="true">
<xs:annotation>
<xs:documentation>DR line</xs:documentation>
</xs:annotation>
<xs:sequence>
<xs:element name="property" type="propertyBaseType" minOccurs="0" maxOccurs="unbounded"/>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="db" type="xs:string" use="required"/>
<xs:attribute name="id" type="xs:string" use="required"/>
<xs:attribute name="iRefID" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="citationDBType">
<xs:annotation>
<xs:documentation>This dbRef type is meant for citation database such as PubMed and MEDLINE.</xs:documentation>
<xs:documentation>This dbRef type is meant for citation database such as PubMed and MEDLINE.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:restriction base="dbReferenceBaseType">
<xs:sequence>
<xs:element name="evList" type="evListType" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="db" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="PubMed"/>
<xs:enumeration value="MEDLINE"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="id" type="xs:string" use="required"/>
<xs:attribute name="iRefID" type="xs:string" use="required"/>
</xs:restriction>
</xs:complexContent>
</xs:complexType>
<!-- DB reference definition ends -->
<!-- Citation type section begins -->
<xs:group name="citationContentGroup">
<xs:sequence>
<xs:element name="authorList" type="nameListType"/>
<xs:element name="dbReferenceList" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="dbReference" type="citationDBType" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="iRefList" type="iRefListType" minOccurs="0"/>
</xs:sequence>
</xs:group>
<xs:complexType name="citationType" abstract="true">
<xs:annotation>
<xs:documentation>The citation super type</xs:documentation>
</xs:annotation>
<xs:attribute name="iRefID" type="xs:string" use="optional"/>
</xs:complexType>
<xs:complexType name="bookType">
<xs:annotation>
<xs:documentation>Stores all information about a book.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="citationType">
<xs:sequence>
<xs:element name="title" type="freeTextType" minOccurs="0"/>
<xs:element name="bookTitle" type="xs:string"/>
<xs:element name="editorList" type="nameListType" minOccurs="0"/>
<xs:group ref="citationContentGroup"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="book"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="volume" type="xs:string" use="optional"/>
<xs:attribute name="year" type="xs:int" use="required"/>
<xs:attribute name="first" type="xs:unsignedInt" use="required"/>
<xs:attribute name="last" type="xs:unsignedInt" use="required"/>
<xs:attribute name="ISDN" type="xs:string" use="optional"/>
<xs:attribute name="publisher" type="xs:string" use="required"/>
<xs:attribute name="city" type="xs:string" use="required"/>
<xs:attribute name="country" type="xs:string" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="electronicType">
<xs:annotation>
<xs:documentation>Stores all information about a so-called online citation.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="citationType">
<xs:sequence>
<xs:element name="title" type="freeTextType" minOccurs="0"/>
<xs:group ref="citationContentGroup"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="online journal article"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="volume" type="xs:string" use="optional"/>
<xs:attribute name="year" type="xs:int" use="required"/>
<xs:attribute name="issue" type="xs:unsignedInt" use="optional">
<xs:annotation>
<xs:documentation>Currently used only in the "Worm Breeder's Gazette".</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="articleNo" type="xs:unsignedInt" use="required">
<xs:annotation>
<xs:documentation>Currently used only in the "Worm Breeder's Gazette".</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="name" type="xs:string" use="optional">
<xs:annotation>
<xs:documentation>Can be used for stating the name of the electronic journal.</xs:documentation>
</xs:annotation>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="incompleteJournalType">
<xs:annotation>
<xs:documentation>Stores all information about an incomplete journal article.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="citationType">
<xs:sequence>
<xs:element name="title" type="freeTextType" minOccurs="0"/>
<xs:group ref="citationContentGroup"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="incomplete journal article"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="first" type="xs:string" use="optional"/>
<xs:attribute name="last" type="xs:string" use="optional"/>
<xs:attribute name="volume" type="xs:string" use="optional"/>
<xs:attribute name="year" type="xs:int" use="optional"/>
<xs:attribute name="name" type="xs:string" use="optional"/>
<xs:attribute name="ISSN" type="xs:string" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="journalType">
<xs:annotation>
<xs:documentation>Stores all information about a journal article.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="citationType">
<xs:sequence>
<xs:element name="title" type="freeTextType"/>
<xs:group ref="citationContentGroup"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="journal article"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="first" type="xs:string" use="required"/>
<xs:attribute name="last" type="xs:string" use="required"/>
<xs:attribute name="volume" type="xs:string" use="required"/>
<xs:attribute name="year" type="xs:int" use="required"/>
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="ISSN" type="xs:string" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="observationType">
<xs:annotation>
<xs:documentation>Stores all information about a citation of the type "Unpublished Observations".</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="citationType">
<xs:sequence>
<xs:group ref="citationContentGroup"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="unpublished observations"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="date" type="xs:gYearMonth" use="required"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="patentType">
<xs:annotation>
<xs:documentation>Stores all information about a patent.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="citationType">
<xs:sequence>
<xs:element name="title" type="freeTextType" minOccurs="0"/>
<xs:group ref="citationContentGroup" minOccurs="0"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="patent"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="number" type="xs:string" use="required"/>
<xs:attribute name="date" type="xs:date" use="required"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="resultType">
<xs:annotation>
<xs:documentation>Stores all information about a citation of the type "Unpublished Results". For the unpublished results type it is necessary that the title element is optional, since one won't find this data in flat files (and might not be added in future, either).</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="citationType">
<xs:sequence>
<xs:element name="title" type="freeTextType" minOccurs="0"/>
<xs:group ref="citationContentGroup"/>
<xs:choice>
<xs:element name="citedInBook" type="bookType"/>
<xs:element name="citedInArticle" type="incompleteJournalType">
<xs:annotation>
<xs:documentation>The type of this element needs to be the incompleteJournalType as the SP-ML converter cannot create the title yet (it doesn't evaluate the PubMed database).</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element name="citedInElectronic" type="electronicType"/>
<xs:element name="citedInThesis" type="thesisType"/>
</xs:choice>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="unpublished results"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="submissionType">
<xs:annotation>
<xs:documentation>Stores all information about a submission to one of the following databases:
-EMBL/GenBank/DDBJ databases
-SWISS-PROT data bank
-HIV data bank
-PDB data bank
-PIR data bank</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="citationType">
<xs:sequence>
<xs:element name="title" type="freeTextType" minOccurs="0"/>
<xs:group ref="citationContentGroup"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="submission"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="date" type="xs:gYearMonth" use="required"/>
<xs:attribute name="db" type="xs:string" use="required"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="thesisType">
<xs:annotation>
<xs:documentation>Stores all information about a thesis.</xs:documentation>
</xs:annotation>
<xs:complexContent>
<xs:extension base="citationType">
<xs:sequence>
<xs:element name="title" type="freeTextType" minOccurs="0"/>
<xs:group ref="citationContentGroup"/>
</xs:sequence>
<xs:attribute name="type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="thesis"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name="institute" type="xs:string" use="required"/>
<xs:attribute name="city" type="xs:string" use="optional"/>
<xs:attribute name="country" type="xs:string" use="required"/>
<xs:attribute name="year" type="xs:int" use="required"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:complexType name="groupType">
<xs:attribute name="name" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="personType">
<xs:attribute name="name" type="xs:string" use="required"/>
<xs:attribute name="forename" type="xs:string" use="optional"/>
<xs:attribute name="surname" type="xs:string" use="optional"/>
</xs:complexType>
<xs:complexType name="nameListType">
<xs:choice maxOccurs="unbounded">
<xs:element name="person" type="personType"/>
<xs:element name="group" type="groupType"/>
</xs:choice>
</xs:complexType>
<!-- Citation type section ends -->
<xs:complexType name="freeTextType" mixed="true">
<xs:sequence minOccurs="0">
<xs:element name="iRefList" type="iRefListType"/>
</xs:sequence>
</xs:complexType>
<xs:complexType name="iRefType">
<xs:attribute name="type" type="xs:string" use="optional"/>
<xs:attribute name="ref" type="xs:string" use="required"/>
</xs:complexType>
<xs:complexType name="iRefListType">
<xs:sequence>
<xs:element name="iRef" type="iRefType" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:schema>

Answer 1

We've found two errors, both which can be worked around.
Currently there is a bug in XMLDB which fails to create a unique name for the case where the subtype and supertype both define an element or attribute with the same name. In your schema both baseCommentType defines an element called evList. massSpecType extends baseCommentType and adds an element with the same name.
This causes an error creating the massSpecType SQLType. The workaround for this is to declare the XMLDB namespace in the schema and use the xdb:SQLName annotation to define a unique name for the second element.
Eg
     <xs:complexType name="massSpecType" mixed="true">
          <xs:complexContent mixed="true">
               <xs:extension base="baseCommentType">
                    <xs:sequence minOccurs="0">
                         <xs:element name="range" minOccurs="0" maxOccurs="unbounded">
                              <xs:complexType>
                                   <xs:attribute name="begin" type="xs:int" use="required"/>
                                   <xs:attribute name="end" type="xs:int" use="required"/>
                              </xs:complexType>
                         </xs:element>
                         <xs:element name="evList" type="evListType" minOccurs="0" xdb:SQLName="EVLIST1"/>
                    </xs:sequence>
                    <xs:attribute name="topic" use="required">
                         <xs:simpleType>
                              <xs:restriction base="xs:string">
                                   <xs:enumeration value="mass spectrometry"/>
                              </xs:restriction>
                         </xs:simpleType>
                    </xs:attribute>
                    <xs:attribute name="molWeight" type="xs:float" use="required"/>
                    <xs:attribute name="mwError" type="xs:string" use="optional"/>
                    <xs:attribute name="msMethod" type="xs:string" use="optional"/>
               </xs:extension>
          </xs:complexContent>
     </xs:complexType>
Eg...
The second issue with the /u0000 is caused by the key/key reference definitions in the schema.
If you comment them out the schema will register
                         <!--
                         <xs:key name="referenceKey">
                              <xs:selector xpath="organismList/organism|dbReferenceList/dbReference"/>
                              <xs:field xpath="@iRefID"/>
                         </xs:key>
                         <xs:key name="evidenceReferenceKey">
                              <xs:selector xpath="evidenceList/evidence"/>
                              <xs:field xpath="@evID"/>
                         </xs:key>
                         <xs:keyref name="evidenceReference" refer="evidenceReferenceKey">
                              <xs:selector xpath=".//ev"/>
                              <xs:field xpath="@ref"/>
                         </xs:keyref>
-->