<?xml version="1.0" encoding="UTF-8"?>
<!--

DataOne Dublin Core Extended Schema v1.0

This schema is based on the Library of Congres Dublin Core Extended Schema:
www.loc.gov/standards/sru/cql/contextSets/dcx/dcx.xsd
by Ray Denenberg (Library of Congress)

However this schema uses an unmodified dcterms.xsd schema and 
removes use of the 'mediator' and 'educationLevel' elements.  This is done
to avoid the substitution group ambiguity issues found in these elements
 when used in <xs:choice> defined parent element.

This schema allows you to include
1. dcterm simple elements (original 15)
2. dcterms elements
3. other elements

An instance looks like this:

<metadata>
	<simpleDc>
		<dcterms:title/>
		<dcterms:creator/>
	</simpleDc>
	<dcTerms>
		<dcterms:abstract/>
	</dcTerms>
	<otherElements>
		<other:xyz xmlns:other="info:xxx"/>
	</otherElements>
</metadata>

It is strongly encouraged that one 'title', 'abstract', at least one 'creator', 
	and a 'dateSubmitted' or 'available' date be provided.  This aids in the display of the document
	in the search index and search engine views.

-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
	targetNamespace="http://ns.dataone.org/metadata/schema/onedcx/v1.0"
 	xmlns="http://ns.dataone.org/metadata/schema/onedcx/v1.0"
  	xmlns:dcterms="http://purl.org/dc/terms/" 
  	elementFormDefault="qualified" 
  	attributeFormDefault="unqualified">

	<xs:import namespace="http://purl.org/dc/terms/" schemaLocation="http://dublincore.org/schemas/xmls/qdc/2008/02/11/dcterms.xsd"/>
	<!--
Root element declarations:
-->
	<xs:element name="metadata" type="onedcxType"/>
	<!--
End root element declarations:
-->
	<xs:complexType name="onedcxType">
		<xs:sequence>
			<xs:element name="simpleDc" minOccurs="0" maxOccurs="1" type="simpleDcType"/>
			<xs:element name="dcTerms" minOccurs="0" maxOccurs="1" type="dcTermsType"/>
			<xs:element name="otherElements" minOccurs="0" maxOccurs="1" type="otherElementsType"/>
		</xs:sequence>
	</xs:complexType>
	<xs:complexType name="simpleDcType">
		<xs:choice maxOccurs="unbounded">
			<xs:element ref="dcterms:title"/>
			<xs:element ref="dcterms:creator"/>
			<xs:element ref="dcterms:subject"/>
			<xs:element ref="dcterms:description"/>
			<xs:element ref="dcterms:publisher"/>
			<xs:element ref="dcterms:contributor"/>
			<xs:element ref="dcterms:date"/>
			<xs:element ref="dcterms:type"/>
			<xs:element ref="dcterms:format"/>
			<xs:element ref="dcterms:identifier"/>
			<xs:element ref="dcterms:source"/>
			<xs:element ref="dcterms:language"/>
			<xs:element ref="dcterms:relation"/>
			<xs:element ref="dcterms:coverage"/>
			<xs:element ref="dcterms:rights"/>
		</xs:choice>
	</xs:complexType>
	<xs:complexType name="dcTermsType">
		<xs:choice maxOccurs="unbounded">
			<xs:element ref="dcterms:alternative"/>
			<xs:element ref="dcterms:tableOfContents"/>
			<xs:element ref="dcterms:abstract"/>
			<xs:element ref="dcterms:created"/>
			<xs:element ref="dcterms:valid"/>
			<xs:element ref="dcterms:available"/>
			<xs:element ref="dcterms:issued"/>
			<xs:element ref="dcterms:modified"/>
			<xs:element ref="dcterms:dateAccepted"/>
			<xs:element ref="dcterms:dateCopyrighted"/>
			<xs:element ref="dcterms:dateSubmitted"/>
			<xs:element ref="dcterms:extent"/>
			<xs:element ref="dcterms:medium"/>
			<xs:element ref="dcterms:isVersionOf"/>
			<xs:element ref="dcterms:hasVersion"/>
			<xs:element ref="dcterms:isReplacedBy"/>
			<xs:element ref="dcterms:replaces"/>
			<xs:element ref="dcterms:isRequiredBy"/>
			<xs:element ref="dcterms:requires"/>
			<xs:element ref="dcterms:isPartOf"/>
			<xs:element ref="dcterms:hasPart"/>
			<xs:element ref="dcterms:isReferencedBy"/>
			<xs:element ref="dcterms:references"/>
			<xs:element ref="dcterms:isFormatOf"/>
			<xs:element ref="dcterms:hasFormat"/>
			<xs:element ref="dcterms:conformsTo"/>
			<xs:element ref="dcterms:spatial"/>
			<xs:element ref="dcterms:temporal"/>
			<xs:element ref="dcterms:audience"/>
			<xs:element ref="dcterms:accrualMethod"/>
			<xs:element ref="dcterms:accrualPeriodicity"/>
			<xs:element ref="dcterms:accrualPolicy"/>
			<xs:element ref="dcterms:instructionalMethod"/>
			<xs:element ref="dcterms:provenance"/>
			<xs:element ref="dcterms:rightsHolder"/>
			<xs:element ref="dcterms:accessRights"/>
			<xs:element ref="dcterms:license"/>
			<xs:element ref="dcterms:bibliographicCitation"/>
		</xs:choice>
	</xs:complexType>
	<xs:complexType name="otherElementsType">
		<xs:sequence>
			<xs:any maxOccurs="unbounded" namespace="##any" processContents="lax"/>
		</xs:sequence>
	</xs:complexType>
</xs:schema>