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METS  April 2001

METS April 2001

Subject:

METS Draft

From:

Jerome McDonough <[log in to unmask]>

Reply-To:

Metadata Encoding and Transmission Standard <[log in to unmask]>

Date:

Mon, 23 Apr 2001 16:54:02 -0400

Content-Type:

multipart/mixed

Parts/Attachments:

Parts/Attachments

text/plain (16 lines) , mets.xsd (549 lines) , Unknown Name (9 lines)

Greetings,

Attached you will find a draft release of the METS schema which I've created
based on our discussions in February. I've tried to keep the design of this
schema fairly closely in line with the original MOA2 DTD, while adding the
necessary new functionality, and disposing of restrictions in MOA2 that
were problematic. I will attempt to come up with an example document based
on an oral history on file here at NYU and distribute that, so that people can
see how I envision the new linking facilities for audio/video materials.

If you have comments about the draft that you want to circulate before
the meeting in San Francisco, please feel free to send them along to the list.
Thanks, and see you all soon.



<?xml version="1.0" encoding="UTF-8"?>
<!-- METS: Metadata Encoding and Transmission Standard -->
<!-- Prepared for the Digital Library Federation by Jerome McDonough, New York University.-->
<!-- April 23, 2001 -->
<!-- Version 1.0 (alpha) -->
<!-- Change History -->
<!-- April 23, 2001: Alpha Draft completed -->
<xsd:schema targetNamespace="http://www.loc.gov/METS/" xmlns="http://www.loc.gov/METS/" xmlns:xsd="http://www.w3.org/2000/10/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
        <xsd:element name="mets" type="metsType">
                <xsd:annotation>
                        <xsd:documentation>METS: Metadata Encoding and Transmission Standard.
                        METS is intended to provide a standardized XML format for transmission
                        of complex digital library objects between systems. As such, it can be seen
                        as filling a role similar to that defined for the Submission Information Package
                        (SIP) and Dissemination Information Package (DIP) in the Reference Model
                        for an Open Archival Information System.
                        </xsd:documentation>
                </xsd:annotation>
        </xsd:element>
        <xsd:element name="dmdSec" type="mdSecType">
                <xsd:annotation>
                        <xsd:documentation>dmdSec: Description Metadata Section.
                        This section records all of the descriptive metadata for all subobjects in the METS object.
                        Metadata can be either included in the METS hub document (mdWrap) or
                        referenced via an identifier/locator (mdRef), a la Warwick Framework. Multiple
                        mdRef and mdWrap elements are allowed so that descriptive metadata
                        can be recorded for each separate subobject within the METS object.</xsd:documentation>
                </xsd:annotation>
        </xsd:element>
        <xsd:element name="amdSec" type="amdSecType">
                <xsd:annotation>
                        <xsd:documentation>amdSec: Administrative Metadata Section.
                        This section records all of the administrative metadata for all subobjects in the METS object,
                        and is divided into four subsections: techMD (technical metadata), rightsMD
                        (intellectual property rights metadata), sourceMD (provenance metadata) and
                        preservation (preservation metadata). Each of these subsections follows the
                        mdSecType model, so that they can either include metadata within the METS
                        hub document (mdWrap) or reference it via an identifier/locator (mdRef). Multiple
                        mdRef and mdWrap elements are allowed so that administrative metadata
                        can be recorded for each separate subobject within the METS object.</xsd:documentation>
                </xsd:annotation>
        </xsd:element>
        <xsd:element name="fileGrp" type="fileGrpType">
                <xsd:annotation>
                        <xsd:documentation>fileGrp: File Group.
                        File Groups record information regarding all of the data files comprising
                        the digital object, including both master files and derivatives. File Groups
                        may both repeat and nest to provide an organizing framework for data files.
                        </xsd:documentation>
                </xsd:annotation>
        </xsd:element>
        <xsd:element name="structMap">
                <xsd:annotation>
                        <xsd:documentation>structMap: Structural Map.
                        The structural map is the heart of a METS document, defining the
                        hierarchical arrangement of a primary source document which has
                        been digitized. This hierarchy is encoded as a tree of 'div' elements.
                        Any given 'div' can point to another METS document via the 'mptr'
                        element, or to a single file, to a group of files, or to segments of individual
                        files or groups of files through the 'fptr' and subsidiary elements.
                        </xsd:documentation>
                </xsd:annotation>
                <xsd:complexType>
                        <xsd:complexContent>
                                <xsd:extension base="structMapType"/>
                        </xsd:complexContent>
                </xsd:complexType>
        </xsd:element>
        <xsd:element name="div" type="divType">
                <xsd:annotation>
                        <xsd:documentation>div: Division of a structural map.
                                Nested div elements define the hierarchical structure of the digital library object.
                                Div elements are linked to the content corresponding to that div by subsidiary mptr and
                                fptr elements. Div elements have the following attributes:
                                1. ID (an XML ID);
                                2. N: an integer representation of this div's order among its siblings (e.g., its page number);
                                3. NUMBER: a string representation of this div's order among its siblings (e.g., "Page xii");
                                4. LABEL: a string to describe this div to an end user viewing the document, as per
                                a table of contents entry; and
                                5. DMD: a set of IDREFs to descriptive metadata sections within this METS document
                                applicable to this div.
                        </xsd:documentation>
                </xsd:annotation>
        </xsd:element>
        <xsd:complexType name="metsType">
                <xsd:annotation>
                        <xsd:documentation>mets Complex Type.
                        A METS document consists of four possible subsidiary sections:
                        dmdSec (descriptive metadata section), amdSec (administrative
                        metadata section), fileGrp (file inventory group), and structMap
                        (structural map). It also has four possible attributes: ID (an XML
                        ID), OBJID (a primary identifier assigned to the original source
                        document), LABEL (a title/text string identifying the document for
                        users), and TYPE (a type for the object, e.g., book, journal,
                        stereograph, etc.).</xsd:documentation>
                </xsd:annotation>
                <xsd:sequence>
                        <xsd:element ref="dmdSec" minOccurs="0" maxOccurs="unbounded"/>
                        <xsd:element ref="amdSec" minOccurs="0" maxOccurs="unbounded"/>
                        <xsd:element ref="fileGrp" maxOccurs="unbounded"/>
                        <xsd:element ref="structMap" maxOccurs="unbounded"/>
                </xsd:sequence>
                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                <xsd:attribute name="OBJID" type="xsd:string" use="optional"/>
                <xsd:attribute name="LABEL" type="xsd:string" use="optional"/>
                <xsd:attribute name="TYPE" type="xsd:string" use="optional"/>
        </xsd:complexType>
        <xsd:complexType name="amdSecType">
                <xsd:annotation>
                        <xsd:documentation>amdSecType: Complex Type for Administrative Metadata.
                        The administrative metadata section consists of four possible subsidiary
                        sections: techMD (technical metadata for text/image/audio/video files),
                        rightsMD (intellectual property rights metadata), sourceMD (source
                        metadata i.e. provenance), and preservationMD (preservation metadata
                        necessary to maintain the digital library object in the long term). amdSecType
                        has a single attribute, ID (XML ID).</xsd:documentation>
                </xsd:annotation>
                <xsd:sequence>
                        <xsd:element name="techMD" type="mdSecType" minOccurs="0" maxOccurs="unbounded">
                                <xsd:annotation>
                                        <xsd:documentation>techMD: technical metadata.
                                                The techMD element provides a wrapper around a generic metadata section,
                                                which should contain technical metadata regarding a file or files. It has a single
                                                attribute, ID, which file/fileGrp elements can use to reference the technical
                                                metadata that applies to them.
                                        </xsd:documentation>
                                </xsd:annotation>
                        </xsd:element>
                        <xsd:element name="rightsMD" type="mdSecType" minOccurs="0" maxOccurs="unbounded">
                                <xsd:annotation>
                                        <xsd:documentation>rightsMD: intellectual property rights metadata.
                                                The rightsMD element provides a wrapper around a generic metadata section,
                                                which should contain IP rights metadata. It has a single attribute, ID, which
                                                file/fileGrp/div elements can use to reference IP Rights metadata that applies to them.
                                        </xsd:documentation>
                                </xsd:annotation>
                        </xsd:element>
                        <xsd:element name="sourceMD" type="mdSecType" minOccurs="0" maxOccurs="unbounded">
                                <xsd:annotation>
                                        <xsd:documentation>sourceMD: source metadata.
                                                The sourceMD element provides a wrapper around a generic metadata section
                                                which should contain source/provenance information. It has a single attribute,
                                                ID, which file/fileGrp elements can use to reference the source metadata which
                                                applies to them.
                                        </xsd:documentation>
                                </xsd:annotation>
                        </xsd:element>
                        <xsd:element name="preservationMD" type="mdSecType" minOccurs="0" maxOccurs="unbounded">
                                <xsd:annotation>
                                        <xsd:documentation>preservationMD: preservation metadata.
                                                The preservationMD element provides a wrapper around a generic metadata
                                                section which should contain preservation metadata. It has a single attribute,
                                                ID, which file/fileGrp elements can use to reference the preservation metadata
                                                which applies to them.
                                        </xsd:documentation>
                                </xsd:annotation>
                        </xsd:element>
                </xsd:sequence>
                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
        </xsd:complexType>
        <xsd:complexType name="fileGrpType">
                <xsd:annotation>
                        <xsd:documentation>fileGrpType: Complex Type for File Groups.
                                The file group is used to cluster all of the digital files composing a digital
                                library object in a hierarchical arrangement (fileGrp is recursively defined
                                to enable the creation of the hierarchy). Any file group may contain zero or
                                more file elements. File elements in turn can contain a FLocat element
                                (a pointer to a file containing content for this object) and/or a FContent
                                element (the contents of the file Base64 encoded).
                        </xsd:documentation>
                </xsd:annotation>
                <xsd:choice>
                        <xsd:element ref="fileGrp" minOccurs="0" maxOccurs="unbounded"/>
                        <xsd:element name="file" minOccurs="0" maxOccurs="unbounded">
                                <xsd:annotation>
                                        <xsd:documentation>file: File element.
                                                The file element provides access to content files for a METS document.
                                                It has the following attributes:
                                                1. ID: an XML ID for the element;
                                                2. MIMETYPE: the MIME type for the file;
                                                3. SEQ: an integer indicating the sequence of this file relative to the others in its file group;
                                                4. SIZE: the size of the file in bytes;
                                                5. CREATED: the date of creation for the file;
                                                6. OWNERID: a primary identifier assigned to the file by its owner;
                                                7. ADMID: IDREFS to administrative metadata sections in the METS document
                                                that correspond with this file; and
                                                8. GROUPID: an identifier that establishes a correspondence between this file
                                                and files in other file groups. Typically, this will be used to associate a master
                                                file in one file group with derivative files in other file groups.
                                                A file element may contain an FLocat element, which provides a pointer to
                                                a content file, and/or an FContent element, which wraps an encoded version
                                                of the file.
                                        </xsd:documentation>
                                </xsd:annotation>
                                <xsd:complexType>
                                        <xsd:sequence>
                                                <xsd:element name="FLocat" minOccurs="0">
                                                        <xsd:annotation>
                                                                <xsd:documentation>FLocat: File Location.
                                                                        The FLocat element provides a pointer to the location of a content file.
                                                                        It has two attributes: ID (an XML ID), and LOCTYPE (the type of locator
                                                                        contained in the FLocat element).
                                                                </xsd:documentation>
                                                        </xsd:annotation>
                                                        <xsd:complexType>
                                                                <xsd:simpleContent>
                                                                        <xsd:extension base="xsd:string">
                                                                                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                                                                                <xsd:attribute name="LOCTYPE" use="required">
                                                                                        <xsd:simpleType>
                                                                                                <xsd:restriction base="xsd:string">
                                                                                                        <xsd:enumeration value="URN"/>
                                                                                                        <xsd:enumeration value="URL"/>
                                                                                                        <xsd:enumeration value="PURL"/>
                                                                                                        <xsd:enumeration value="HANDLE"/>
                                                                                                        <xsd:enumeration value="DOI"/>
                                                                                                        <xsd:enumeration value="PDI"/>
                                                                                                </xsd:restriction>
                                                                                        </xsd:simpleType>
                                                                                </xsd:attribute>
                                                                        </xsd:extension>
                                                                </xsd:simpleContent>
                                                        </xsd:complexType>
                                                </xsd:element>
                                                <xsd:element name="FContent" minOccurs="0">
                                                        <xsd:annotation>
                                                                <xsd:documentation>FContent: file content.
                                                                        The FContent element is used to deliver a content file for a METS
                                                                        document within the METS file itself. The content file must be Base 64
                                                                        encoded, and contained within the FContent wrapper element.
                                                                </xsd:documentation>
                                                        </xsd:annotation>
                                                        <xsd:complexType>
                                                                <xsd:simpleContent>
                                                                        <xsd:extension base="xsd:binary">
                                                                                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                                                                        </xsd:extension>
                                                                </xsd:simpleContent>
                                                        </xsd:complexType>
                                                </xsd:element>
                                        </xsd:sequence>
                                        <xsd:attribute name="ID" type="xsd:ID" use="required"/>
                                        <xsd:attribute name="MIMETYPE" type="xsd:string" use="optional"/>
                                        <xsd:attribute name="SEQ" type="xsd:int" use="optional"/>
                                        <xsd:attribute name="SIZE" type="xsd:long" use="optional"/>
                                        <xsd:attribute name="CREATED" type="xsd:date" use="optional"/>
                                        <xsd:attribute name="OWNERID" type="xsd:string" use="optional"/>
                                        <xsd:attribute name="ADMID" type="xsd:IDREFS" use="optional"/>
                                        <xsd:attribute name="GROUPID" type="xsd:string" use="optional"/>
                                </xsd:complexType>
                        </xsd:element>
                </xsd:choice>
                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                <xsd:attribute name="VERSDATE" type="xsd:date" use="optional"/>
                <xsd:attribute name="ADMIDS" type="xsd:IDREFS" use="optional"/>
        </xsd:complexType>
        <xsd:complexType name="structMapType">
                <xsd:annotation>
                        <xsd:documentation>structMap Complex Type</xsd:documentation>
                </xsd:annotation>
                <xsd:sequence maxOccurs="unbounded">
                        <xsd:element name="div" type="divType">
                                <xsd:annotation>
                                        <xsd:documentation>div: Division.
                                                The METS standard represents a document structurally as a series of nested
                                                div elements, that is, as a hierarchy (e.g., a book, which is composed of chapters,
                                                which is composed of subchapters, which is composed of pages). Every div node
                                                in the structural map hierarchy may be connected (via subsidiary mptr or fptr
                                                elements) to content files which represent that div's portion of the whole document.
                                                The div element has the following attributes:
                                                1. ID (an XML ID);
                                                2. N: an integer representation of this div's order among its siblings
                                                (e.g., its page number);
                                                3. NUMBER: a string representation of this div's order among its siblings (e.g., "Page xii");
                                                4. LABEL: a string to describe this div to an end user viewing the document, as per
                                                a table of contents entry; and
                                                5. DMD: a set of IDREFs to descriptive metadata sections within this METS document
                                                applicable to this div.
                                        </xsd:documentation>
                                </xsd:annotation>
                        </xsd:element>
                </xsd:sequence>
                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
        </xsd:complexType>
        <xsd:complexType name="divType">
                <xsd:annotation>
                        <xsd:documentation>Div Complex Type</xsd:documentation>
                </xsd:annotation>
                <xsd:sequence>
                        <xsd:element name="mptr" minOccurs="0" maxOccurs="unbounded">
                                <xsd:annotation>
                                        <xsd:documentation>mptr: METS Pointer.
                                                The mptr element allows a div to be associated with a separate METS document
                                                containing the content corresponding with that div, rather than pointing to an
                                                internal file or file group. A typical instance of this would be the case of a METS
                                                document for a journal run, with a div elements for each individual journal issue.
                                                The div elements for the issues might point to separate METS documents for each
                                                issue, rather than having files and file groups for every issue encoded in one
                                                document. The mptr is derived from the XLink recommendation of the W3C,
                                                and should be used according to W3C guidelines.
                                        </xsd:documentation>
                                </xsd:annotation>
                                <xsd:complexType>
                                        <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                                        <xsd:attribute name="type" type="xsd:string" use="fixed" value="simple"/>
                                        <xsd:attribute name="href" type="xsd:uriReference" use="required"/>
                                        <xsd:attribute name="role" type="xsd:string"/>
                                        <xsd:attribute name="arcrole" type="xsd:string"/>
                                        <xsd:attribute name="title" type="xsd:string"/>
                                        <xsd:attribute name="show">
                                                <xsd:simpleType>
                                                        <xsd:restriction base="xsd:NMTOKEN">
                                                                <xsd:enumeration value="new"/>
                                                                <xsd:enumeration value="replace"/>
                                                                <xsd:enumeration value="embed"/>
                                                                <xsd:enumeration value="other"/>
                                                                <xsd:enumeration value="none"/>
                                                        </xsd:restriction>
                                                </xsd:simpleType>
                                        </xsd:attribute>
                                        <xsd:attribute name="actuate">
                                                <xsd:simpleType>
                                                        <xsd:restriction base="xsd:NMTOKEN">
                                                                <xsd:enumeration value="onLoad"/>
                                                                <xsd:enumeration value="onRequest"/>
                                                                <xsd:enumeration value="other"/>
                                                                <xsd:enumeration value="none"/>
                                                        </xsd:restriction>
                                                </xsd:simpleType>
                                        </xsd:attribute>
                                </xsd:complexType>
                        </xsd:element>
                        <xsd:element name="fptr" minOccurs="0" maxOccurs="unbounded">
                                <xsd:annotation>
                                        <xsd:documentation>fptr: File Pointer.
                                                The fptr element associates a div element with content files that represent that div.
                                                It can either point to a file directly itself, via the FILEID attribute, or it can do more
                                                complex links to content via the subsidiary par and seq elements.
                                        </xsd:documentation>
                                </xsd:annotation>
                                <xsd:complexType>
                                        <xsd:choice>
                                                <xsd:element name="par" minOccurs="0">
                                                        <xsd:annotation>
                                                                <xsd:documentation>par: Parallel files.
                                                                        The par element should used to link a div to a set of content files when
                                                                        those files should be played back in unison to display the content to the
                                                                        user. Individual area subelements within the par element provide the links
                                                                        to the files or portions thereof.
                                                                </xsd:documentation>
                                                        </xsd:annotation>
                                                        <xsd:complexType>
                                                                <xsd:sequence>
                                                                        <xsd:element name="area" type="areaType" maxOccurs="unbounded"/>
                                                                </xsd:sequence>
                                                                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                                                        </xsd:complexType>
                                                </xsd:element>
                                                <xsd:element name="seq" minOccurs="0">
                                                        <xsd:annotation>
                                                                <xsd:documentation>seq: Sequence of files.
                                                                        The seq element should be used to link a div to one or more content files
                                                                        when those files should be played sequentially to display content to a user,
                                                                        or where there is only one file to link, but the link from div to file requires
                                                                        identifying a subcomponent of a file.
                                                                </xsd:documentation>
                                                        </xsd:annotation>
                                                        <xsd:complexType>
                                                                <xsd:sequence>
                                                                        <xsd:element name="area" type="areaType" maxOccurs="unbounded"/>
                                                                </xsd:sequence>
                                                                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                                                        </xsd:complexType>
                                                </xsd:element>
                                        </xsd:choice>
                                        <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                                        <xsd:attribute name="FILEID" type="xsd:IDREF" use="optional"/>
                                </xsd:complexType>
                        </xsd:element>
                        <xsd:element ref="div" minOccurs="0" maxOccurs="unbounded"/>
                </xsd:sequence>
                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                <xsd:attribute name="N" type="xsd:integer" use="optional"/>
                <xsd:attribute name="NUMBER" type="xsd:string" use="optional"/>
                <xsd:attribute name="LABEL" type="xsd:string" use="optional"/>
                <xsd:attribute name="DMD" type="xsd:IDREFS" use="optional"/>
        </xsd:complexType>
        <xsd:complexType name="areaType">
                <xsd:annotation>
                        <xsd:documentation>areaType: Complex Type for Area linking.
                                The area element provides for more sophisticated linking between a div
                                element and content files representing that div, be they text, image,
                                audio, or video files. An area element can link a div to a point
                                within a file, to a one-dimension segment of a file (e.g., text screen,
                                image line, audio/video clip), or a two-dimensional section of a file
                                (e.g, subsection of an image, or a subsection of the video display
                                of a video file. The area element has no content, and the following
                                attributes:
                                1. ID: an XML ID;
                                2. FILE: an IDREF to the file element being pointed to by the div;
                                3. SHAPE: a text string defining the shape of a two-dimensional
                                area being referenced in a link file;
                                4. COORDS: a text string representing a set of visual coordinates
                                within an image (still image or video frame). The COORDS and
                                SHAPE attributes should be used as in HTML 4;
                                5. BEGIN: a beginning location in a referenced file;
                                6. END: an ending location in a referenced file;
                                7. BETYPE: the syntax used in specifying the BEGIN and END
                                attributes (byte offset, IDREF value, or SMPTE time code);
                                8. EXTENT: the duraction of the segment; and
                                9. EXTTYPE: the syntax used in specifying the extent (byte length
                                or SMPTE time value).
                        </xsd:documentation>
                </xsd:annotation>
                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
                <xsd:attribute name="FILE" type="xsd:IDREF" use="required"/>
                <xsd:attribute name="SHAPE" use="optional">
                        <xsd:simpleType>
                                <xsd:restriction base="xsd:string">
                                        <xsd:enumeration value="rect"/>
                                        <xsd:enumeration value="circle"/>
                                        <xsd:enumeration value="poly"/>
                                </xsd:restriction>
                        </xsd:simpleType>
                </xsd:attribute>
                <xsd:attribute name="COORDS" type="xsd:string" use="optional"/>
                <xsd:attribute name="BEGIN" type="xsd:string" use="optional"/>
                <xsd:attribute name="END" type="xsd:string" use="optional"/>
                <xsd:attribute name="BETYPE" use="optional">
                        <xsd:simpleType>
                                <xsd:restriction base="xsd:string">
                                        <xsd:enumeration value="BYTE"/>
                                        <xsd:enumeration value="IDREF"/>
                                        <xsd:enumeration value="SMPTE"/>
                                </xsd:restriction>
                        </xsd:simpleType>
                </xsd:attribute>
                <xsd:attribute name="EXTENT" type="xsd:string" use="optional"/>
                <xsd:attribute name="EXTTYPE" use="optional">
                        <xsd:simpleType>
                                <xsd:restriction base="xsd:string">
                                        <xsd:enumeration value="BYTE"/>
                                        <xsd:enumeration value="SMPTE"/>
                                </xsd:restriction>
                        </xsd:simpleType>
                </xsd:attribute>
        </xsd:complexType>
        <xsd:complexType name="mdSecType">
                <xsd:annotation>
                        <xsd:documentation>mdSec (metadata section) Complex Type</xsd:documentation>
                </xsd:annotation>
                <xsd:sequence>
                        <xsd:element name="mdRef" minOccurs="0" maxOccurs="unbounded">
                                <xsd:annotation>
                                        <xsd:documentation>mdRef: metadata reference.
                                                The mdRef element is a generic element used throughout the METS schema
                                                to provide a pointer to metadata which resides outside the METS document.
                                                It has the following attributes:
                                                1. ID: an XML ID;
                                                2. LOCTYPE: the type of locator contained in the body of the element;
                                                3. MIMETYPE: the MIME type for the metadata being pointed at;
                                                4. MDType: the type of metadata being pointed at (e.g., MARC, EAD, etc.);
                                                5. LABEL: a label to display to the viewer of the METS document identifying the metadata; and
                                                6. XPTR: an xptr to a location within the file pointed to by the mdRef element, if applicable. </xsd:documentation>
                                </xsd:annotation>
                                <xsd:complexType>
                                        <xsd:simpleContent>
                                                <xsd:extension base="xsd:string">
                                                        <xsd:attribute name="ID" type="xsd:ID" use="required"/>
                                                        <xsd:attribute name="LOCTYPE" use="required">
                                                                <xsd:simpleType>
                                                                        <xsd:restriction base="xsd:string">
                                                                                <xsd:enumeration value="URN"/>
                                                                                <xsd:enumeration value="URL"/>
                                                                                <xsd:enumeration value="PURL"/>
                                                                                <xsd:enumeration value="HANDLE"/>
                                                                                <xsd:enumeration value="DOI"/>
                                                                                <xsd:enumeration value="PDI"/>
                                                                                <xsd:enumeration value="OTHER"/>
                                                                        </xsd:restriction>
                                                                </xsd:simpleType>
                                                        </xsd:attribute>
                                                        <xsd:attribute name="MIMETYPE" type="xsd:string" use="optional"/>
                                                        <xsd:attribute name="MDTYPE" use="required">
                                                                <xsd:simpleType>
                                                                        <xsd:restriction base="xsd:string">
                                                                                <xsd:enumeration value="MARC"/>
                                                                                <xsd:enumeration value="EAD"/>
                                                                                <xsd:enumeration value="VRA"/>
                                                                                <xsd:enumeration value="DC"/>
                                                                                <xsd:enumeration value="NISOIMG"/>
                                                                                <xsd:enumeration value="LC-AV"/>
                                                                                <xsd:enumeration value="VRA"/>
                                                                                <xsd:enumeration value="TEIHDR"/>
                                                                                <xsd:enumeration value="OTHER"/>
                                                                        </xsd:restriction>
                                                                </xsd:simpleType>
                                                        </xsd:attribute>
                                                        <xsd:attribute name="LABEL" type="xsd:string" use="optional"/>
                                                        <xsd:attribute name="XPTR" type="xsd:string" use="optional"/>
                                                </xsd:extension>
                                        </xsd:simpleContent>
                                </xsd:complexType>
                        </xsd:element>
                        <xsd:element name="mdWrap" minOccurs="0" maxOccurs="unbounded">
                                <xsd:annotation>
                                        <xsd:documentation>mdWrap: metadata wrapper.
                                                The mdWrap element is a generic element used throughout the METS schema to allow
                                                the encoder to place arbitrary metadata conforming to other standards/schema within a
                                                METS document. The included metadata can either be encoded in XML, in which case
                                                it may be placed directly within the mdWrap element, or it can be Base64 encoded, and
                                                placed within a subsidiary binData element.
                                        </xsd:documentation>
                                </xsd:annotation>
                                <xsd:complexType>
                                        <xsd:choice>
                                                <xsd:element name="binData" type="xsd:binary" minOccurs="0">
                                                        <xsd:annotation>
                                                                <xsd:documentation>A wrapper to contain Base64 encoded metadata. </xsd:documentation>
                                                        </xsd:annotation>
                                                </xsd:element>
                                                <xsd:any namespace="##any"/>
                                        </xsd:choice>
                                        <xsd:attribute name="ID" type="xsd:ID" use="required"/>
                                        <xsd:attribute name="MIMETYPE" type="xsd:string" use="optional"/>
                                        <xsd:attribute name="MDTYPE" use="optional">
                                                <xsd:simpleType>
                                                        <xsd:restriction base="xsd:string">
                                                                <xsd:enumeration value="MARC"/>
                                                                <xsd:enumeration value="EAD"/>
                                                                <xsd:enumeration value="VRA"/>
                                                                <xsd:enumeration value="DC"/>
                                                                <xsd:enumeration value="NISOIMG"/>
                                                                <xsd:enumeration value="LC-AV"/>
                                                                <xsd:enumeration value="VRA"/>
                                                                <xsd:enumeration value="TEIHDR"/>
                                                                <xsd:enumeration value="OTHER"/>
                                                        </xsd:restriction>
                                                </xsd:simpleType>
                                        </xsd:attribute>
                                        <xsd:attribute name="LABEL" type="xsd:string" use="optional"/>
                                </xsd:complexType>
                        </xsd:element>
                </xsd:sequence>
                <xsd:attribute name="ID" type="xsd:ID" use="optional"/>
        </xsd:complexType>
</xsd:schema>


Jerome McDonough
[log in to unmask]
Digital Library Development Team Leader
Elmer Holmes Bobst Library, New York University
70 Washington Square South
New York, NY 10012
(212) 998-2425

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