<xs:element minOccurs="0" ref="TypeOfStudyUnit">
<xs:annotation>
<xs:documentation>
A brief textual identification of the StudyUnit. Supports the use of an external controlled vocabulary.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" ref="r:Citation">
<xs:annotation>
<xs:documentation>
The citation for the study. DDI strongly recommends that at minimum a Title be provided.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" ref="r:Abstract">
<xs:annotation>
<xs:documentation>
An abstract of the study unit describing the nature and scope of the data collection, special characteristics of its content. Note that detailed information on the purpose of the study and structured coverage information are to be entered in Purpose and Coverage. Abstract supports multiple language versions of the same content as well as optional formatting of the content.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:AuthorizationSource">
<xs:annotation>
<xs:documentation>
Identifies the authorizing agency for the study and allows for the full text of the authorization (law, regulation, or other form of authorization). May be used to list authorizations from oversight committees and other regulatory agencies.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" ref="r:DefiningConceptReference">
<xs:annotation>
<xs:documentation>
A concept that defines or aids in understanding the content of the study unit.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" ref="r:UniverseReference">
<xs:annotation>
<xs:documentation>
Reference to the universe statement from the universe scheme, describing the group of persons or other elements that are the object of research and to which any analytic results refer. Age, nationality, and residence commonly help to delineate a given universe, but any of a number of factors may be involved, such as sex, race, income, veteran status, criminal convictions, etc. The universe may consist of elements other than persons, such as housing units, court cases, deaths, countries, etc. In general, it should be possible to tell from the description of the universe whether a given individual or element (hypothetical or real) is a member of the population under study. A universe may be described as "inclusive" or "exclusive". This StudyUnit level reference is normally to the top level of the UniverseScheme.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:SeriesStatement">
<xs:annotation>
<xs:documentation>
A study, particularly one in a series, may be the result of two series merging into a single study. The new study belongs to both series. For example, Niger now fields the UNICEF Multiple Indicators Cluster Survey (MICS) and the Demographic and Health Survey as a single merged instrument.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:QualityStatementReference">
<xs:annotation>
<xs:documentation>
A reference to a Quality Statement pertaining to the quality of the study overall, metadata, or data to which it is associated. Quality statements may be related to external quality standards.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:QualityScheme">
<xs:annotation>
<xs:documentation>
A scheme containing statements of quality related to the quality of methodologies, metadata, or data. Quality statements and standards may be related to external quality standards.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:QualitySchemeReference">
<xs:annotation>
<xs:documentation>
A reference to a QualityStatementScheme containing statements of quality related to the quality of the study methodology, metadata, or data. Quality statements and standards may be related to external quality standards.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:ExPostEvaluation">
<xs:annotation>
<xs:documentation>
An evaluation of the study process, often taking place after the completion of the study. These may include issues such as timing of the study, sequencing issues, cost/budget issues, relevance, institutional or legal arrangements etc. of the study. If the study is part of a series or group (i.e., a single wave in a longitudinal study) this may include evaluation of earlier waves which resulted in changes to the current wave.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:FundingInformation">
<xs:annotation>
<xs:documentation>
Contains details of the study unit's funding, including information about grants, agencies, etc.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="StudyBudget">
<xs:annotation>
<xs:documentation>
This describes the overall budget of the study. It can be repeated for distinct budget activities. It contains a structured description and one or more budget documents described by an OtherMaterial type.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" ref="r:Purpose">
<xs:annotation>
<xs:documentation>
The purpose of the study, why the study took place. This should include detailed information on the investigator's primary study questions or hypotheses as well as information on any legal basis for the data collection, such as laws requiring the collection of census data for apportionment purposes. Legal or other authorization should be provided in detail within AuthorizationSource. Supports multiple language versions of the same content as well as optional formatting of the content.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" ref="r:Coverage">
<xs:annotation>
<xs:documentation>
Describes the coverage of the study unit. Detailed information on Topical, Temporal, and Spatial Coverage is contained here. Note that Coverage at this level should be inclusive all lower level modules or section. Lower level descriptions serve to constrain coverage within the scope described here.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:AnalysisUnit">
<xs:annotation>
<xs:documentation>
Allows the use of a controlled vocabulary to list all of the units of analysis used in the study. Should be repeated to describe multiple units of analysis.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" ref="r:AnalysisUnitsCovered">
<xs:annotation>
<xs:documentation>
A narrative of the units of analysis in the study unit. Uses an InternationalString to support multiple languages.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:KindOfData">
<xs:annotation>
<xs:documentation>
Briefly describes the kind of data documented in a study unit. Examples include survey data, census/enumeration data, administrative data, measurement data, assessment data, demographic data, voting data, etc. Supports the use of an external controlled vocabulary.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:GeneralDataFormat">
<xs:annotation>
<xs:documentation>
Briefly describes the data formats documented in the logical product(s) of a study unit. Examples include Numeric, Text, Audio, Visual, Geospatial, StillImage, Software, 3D, etc. Supports the use of an external controlled vocabulary. The DDI Alliance has provided a controlled vocabulary (KindOfDataFormat) to support this element at http://www.ddialliance.org/controlled-vocabularies.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element minOccurs="0" ref="r:RequiredResourcePackages">
<xs:annotation>
<xs:documentation>
Specifies by reference the ResourcePackages required to resolve the Study. This list is informational and assists in creating full transmissions of metadata or creating archival packages. Primarily used after the instance is relatively stable and published.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element maxOccurs="unbounded" minOccurs="0" ref="r:Embargo">
<xs:annotation>
<xs:documentation>
Embargo information about the study unit. References to embargo information in this section can be made from individual variables.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="r:OtherMaterialScheme">
<xs:annotation>
<xs:documentation>
This scheme contains a set of other materials referenced by the metadata.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:OtherMaterialSchemeReference">
<xs:annotation>
<xs:documentation>
Inclusion of an existing Other Material Scheme by reference.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="c:ConceptualComponent">
<xs:annotation>
<xs:documentation>
Documents the content and relational structure of the concepts, universes, data elements, geographic structures and geographic locations used by the study unit.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:ConceptualComponentReference">
<xs:annotation>
<xs:documentation>
Inclusion of an existing Conceptual Component module by reference.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="d:DataCollection">
<xs:annotation>
<xs:documentation>
Documents the content of the Data Collection activities used in this study; development of data collection processes, questions, question flows (control constructs), data collection instrument, instructions, processing events and instructions, methodology, etc.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:DataCollectionReference">
<xs:annotation>
<xs:documentation>
Inclusion of an existing Data Collection module by reference.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="l:BaseLogicalProduct">
<xs:annotation>
<xs:documentation>
Documents the logical (intellectual) content of the data produced by the study unit. Note that l:BaseLogicalProduct is the head of a substitution group and is replaced by the appropriate member of that substitution group.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:LogicalProductReference">
<xs:annotation>
<xs:documentation>
Inclusion of an existing Logical Product module by reference.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="p:PhysicalDataProduct">
<xs:annotation>
<xs:documentation>
Documents the physical structure of the data produced by the study unit.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:PhysicalDataProductReference">
<xs:annotation>
<xs:documentation>
Inclusion of an existing Physical Data Product module by reference.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="pi:PhysicalInstance">
<xs:annotation>
<xs:documentation>
Documents the link to a specific external data file produced by the study unit. May contain summary and category level statistics on the variables contained in the data file.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:PhysicalInstanceReference">
<xs:annotation>
<xs:documentation>
Inclusion of an existing Physical Instance module by reference.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:choice>
<xs:element ref="pi:PhysicalInstanceGroup">
<xs:annotation>
<xs:documentation>
Allows physical instance modules to be grouped with or without hierarchical structure.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:PhysicalInstanceGroupReference">
<xs:annotation>
<xs:documentation>
Inclusion of a PhysicalInstanceGroup that allows categories to be grouped with or without hierarchical structure by reference. TypeOfObject should be set to PhysicalInstanceGroup.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="a:Archive">
<xs:annotation>
<xs:documentation>
Archive serves as a packet containing both persistent and transient information. Describes archive-specific material including item record information as well as lifecycle information. The metadata in the package is divided into elements that are persistent (should remain with the Study Unit through its life-cycle), and transient (pertinent only to the Study Unit as held by that archive).
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:ArchiveReference">
<xs:annotation>
<xs:documentation>
Inclusion of an existing Archive module by reference.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="l:ClassificationFamily">
<xs:annotation>
<xs:documentation>
Allows for in-line entry of a Classification Family.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:ClassificationFamilyReference">
<xs:annotation>
<xs:documentation>
Allows for inclusion of a Classification Family by reference.
</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>
<xs:choice maxOccurs="unbounded" minOccurs="0">
<xs:element ref="pr:DDIProfile">
<xs:annotation>
<xs:documentation>
Contains a DDI Profile which is used by the study unit.
</xs:documentation>
</xs:annotation>
</xs:element>
<xs:element ref="r:DDIProfileReference">
<xs:annotation>
<xs:documentation>Inclusion of an existing DDIProfile by reference.</xs:documentation>
</xs:annotation>
</xs:element>
</xs:choice>