conceptItem 

An Item containing information about a concept.

Element Information

Model

ANY element from namespace(s) 'http://www.w3.org/2000/09/xmldsig#' , (catalogRef | catalog) , hopHistory{0,1} , rightsInfo* , itemMeta , contentMeta{0,1} , assert* , inlineRef* , derivedFrom* , concept{0,1}
Children: assert, catalog, catalogRef, concept, contentMeta, derivedFrom, hopHistory, inlineRef, itemMeta, rightsInfo

Attributes

QName Type Fixed Default Use Inheritable Annotation
conformance xs:string core optional 
The conformance level with which the Item is conformant.
dir restriction of xs:NMTOKEN optional 
The directionality of textual content (enumeration: ltr, rtl)
guid xs:string required 
The persistent, universally unique identifier common for all versions of the Item.
standard xs:string required 
The IPTC standard with which the Item is conformant.
standardversion restriction of xs:string required 
The major-minor version of the IPTC standard with which the Item is conformant.
version xs:positiveInteger 1 optional 
The version of the Item.
xml:lang union of(xs:language, restriction of xs:string) optional 
Attempting to install the relevant ISO 2- and 3-letter
         codes as the enumerated possible values is probably never
         going to be a realistic possibility.  See
         RFC 3066 at http://www.ietf.org/rfc/rfc3066.txt and the IANA registry
         at http://www.iana.org/assignments/lang-tag-apps.htm for
         further information.

         The union allows for the 'un-declaration' of xml:lang with
         the empty string.
Wildcard: ANY attribute from ANY namespace OTHER than 'http://iptc.org/std/nar/2006-10-01/'

Source 

<xs:element name="conceptItem">
  <xs:annotation>
    <xs:documentation>An Item containing information about a concept.</xs:documentation>
  </xs:annotation>
  <xs:complexType>
    <xs:complexContent>
      <xs:extension base="AnyItemType">
        <xs:sequence>
          <xs:element name="contentMeta" type="ContentMetadataAcDType" minOccurs="0">
            <xs:annotation>
              <xs:documentation>Content Metadata for a Concept Item</xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element ref="assert" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="inlineRef" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="derivedFrom" minOccurs="0" maxOccurs="unbounded"/>
          <xs:element ref="concept" minOccurs="0"/>
        </xs:sequence>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:element>

Sample