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<?xml version="1.0"?>
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<xs:schema targetNamespace="eml:constraint-2.0.0beta8" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:doc="eml:documentation-2.0.0beta8" xmlns="eml:constraint-2.0.0beta8">
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<xs:import namespace="eml:documentation-2.0.0beta8" schemaLocation="eml-documentation.xsd"/>
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<xs:annotation>
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<xs:documentation>
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'$RCSfile: eml-constraint.xsd,v $'
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Copyright: 2000 Regents of the University of California and the
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National Center for Ecological Analysis and Synthesis
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For Details: http://knb.ecoinformatics.org/
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'$Author: berkley $'
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'$Date: 2002/04/21 22:45:30 $'
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'$Revision: 1.15 $'
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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</xs:documentation>
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<xs:appinfo>
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<doc:moduleName>eml-constraint</doc:moduleName>
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<doc:moduleDescription>
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This schema defines the integrity constraints between entities
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(e.g., data tables) as would be maintained in a relational database.
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These constraints include
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primary key constraints, foreign key constraints, unique key
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constraints, check constraints, and not null constraints,
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among potential others.
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</doc:moduleDescription>
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</xs:appinfo>
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</xs:annotation>
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<xs:element name="constraint">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>
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Relational integrity constraint descriptors
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</doc:tooltip>
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<doc:summary>
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Describes the relational integrity constraints of a relational
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database.
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</doc:summary>
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<doc:description>
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Describes the relational integrity constraints of a relational
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database. This includes primary keys, foreign keys, unique keys, etc.
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When an eml-constraint module is created, it should be linked into
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a dataset using the "triple" element, and all of the entities that
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are referenced in the constraints should be accessible within that
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same package.
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</doc:description>
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<doc:example/>
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<doc:lineage>
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New in EML 2.0
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</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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<xs:complexType>
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<xs:sequence>
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<xs:element name="identifier"/>
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<xs:element name="ConstraintBase" type="ConstraintBase"/>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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<xs:complexType name="ConstraintDefinitionBase">
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<xs:sequence>
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>
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Name of the constraint
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</doc:tooltip>
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<doc:summary>
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A meaningfull name of the constraint.
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</doc:summary>
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<doc:description>
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The constraint name represents a human readible and meaningful name for the constraint.
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</doc:description>
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<doc:example>
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PrimaryKey_birdSurvey
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</doc:example>
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<doc:lineage>
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New in EML 2.0.0.
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</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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<xs:element name="constraintName" type="xs:string"/>
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<xs:element name="constraintDescription" minOccurs="0">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>
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Description of the constraint
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</doc:tooltip>
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<doc:summary>
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Descibes the purpose of the constraint.
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</doc:summary>
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<doc:description>
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The constraint description element describes the nature of the
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constraint. It might be a description of a check condition, or a
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statement about the composition of a primary key or the nature
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of the relationship between two database tables or two ascii files.
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</doc:description>
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<doc:example>
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1.Must be greater than 0 but less than 100
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2. "The primary key of the table BIRD_SURVEY is composed of
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two attributes:speciesCode and observationDate
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3. The species name associated with the species code in survey.txt
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can be found in the file speciesList.txt
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</doc:example>
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<doc:lineage>
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New in EML 2.0.0.
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</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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</xs:element>
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<xs:element name="entityID" type="xs:string">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Constrained Entity</doc:tooltip>
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<doc:summary>
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Entity to which this constraint applies
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</doc:summary>
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<doc:description>
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Entity to which this constraint applies. This should be
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an identifer that matches one of the "identifier"
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elements for an entity that is linked into the package
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with a triple. The constraint document itself should be
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linked into the package as a member.
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</doc:description>
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<doc:example>
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knb.78.3
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</doc:example>
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<doc:lineage>
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New in EML 2.0.0
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</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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<xs:complexType name="ConstraintBase">
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<xs:choice>
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<xs:element name="primaryKey">
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<xs:complexType>
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<xs:complexContent>
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<xs:extension base="ConstraintDefinitionBase">
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<xs:sequence>
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<xs:element name="key" minOccurs="0">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Key</doc:tooltip>
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<doc:summary>
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The set of attributes to which this constraint applies.
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</doc:summary>
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<doc:description>
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The set of attributes to which this constraint applies.
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For a primary key or a unique key, the set of attributes
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must be identifying. For a foreign key, the set of
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attributes must match an identifying key in the referenced
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entity. For a not null constraint, the key indicates the
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attribute which should not be null.
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</doc:description>
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<doc:example/>
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<doc:lineage>New in EML 2.0</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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<xs:complexType>
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<xs:sequence>
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<xs:element name="attributeName" type="xs:string" maxOccurs="unbounded">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Attribute Name</doc:tooltip>
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<doc:summary>
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Name of an attribute found in the identified entity
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</doc:summary>
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<doc:description>
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Name of an attribute that can be found in the identified
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entity. This name will be unique within an entity and
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specifies that the attribute participates in the key that
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is being defined.
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</doc:description>
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<doc:example/>
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<doc:lineage>New in EML 2.0</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:sequence>
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</xs:extension>
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</xs:complexContent>
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</xs:complexType>
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</xs:element>
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<xs:element name="uniqueKey">
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<xs:complexType>
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<xs:complexContent>
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<xs:extension base="ConstraintDefinitionBase">
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<xs:sequence>
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<xs:element name="key" minOccurs="0">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Key</doc:tooltip>
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<doc:summary>
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The set of attributes to which this constraint applies.
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</doc:summary>
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<doc:description>
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The set of attributes to which this constraint applies.
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For a primary key or a unique key, the set of attributes must be
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identifying. For a foreign key, the set of attributes must match
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an identifying key in the referenced entity. For a not null
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constraint, the key indicates the attribute which should not
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be null.
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</doc:description>
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<doc:example/>
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<doc:lineage>New in EML 2.0</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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<xs:complexType>
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<xs:sequence>
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<xs:element name="attributeName" type="xs:string" maxOccurs="unbounded">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Attribute Name</doc:tooltip>
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<doc:summary>
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Name of an attribute found in the identified entity
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</doc:summary>
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<doc:description>
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Name of an attribute that can be found in the identified
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entity. This name will be unique within an entity and
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specifies that the attribute participates in the key that
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is being defined.
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</doc:description>
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<doc:example/>
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<doc:lineage>New in EML 2.0</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:sequence>
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</xs:extension>
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</xs:complexContent>
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</xs:complexType>
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</xs:element>
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<xs:element name="checkConstraint">
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<xs:complexType>
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<xs:complexContent>
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<xs:extension base="ConstraintDefinitionBase">
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<xs:sequence>
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<xs:element name="checkCondition" type="xs:string">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Check Condition</doc:tooltip>
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<doc:summary>
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An SQL statement or other language implementation of
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the condition for a check constraint.
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</doc:summary>
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<doc:description>
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A SQL statement or other language implementation of
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the condition for a check constraint.
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Generally this provides a means for constraining the
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values within and among entities.
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</doc:description>
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<doc:example><![CDATA[(year > 1900 and year < 1990)]]></doc:example>
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<doc:lineage>New in EML 2.0</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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</xs:element>
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</xs:sequence>
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</xs:extension>
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</xs:complexContent>
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</xs:complexType>
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</xs:element>
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<xs:element name="foreignKey">
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<xs:complexType>
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<xs:complexContent>
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<xs:extension base="ConstraintDefinitionBase">
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<xs:sequence>
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<xs:element name="key">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Key</doc:tooltip>
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<doc:summary>
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The set of attributes to which this constraint applies.
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</doc:summary>
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<doc:description>
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The set of attributes to which this constraint applies.
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For a primary key or a unique key, the set of attributes must be
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identifying. For a foreign key, the set of attributes must match
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an identifying key in the referenced entity. For a not null
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constraint, the key indicates the attribute which should not
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be null.
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</doc:description>
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<doc:example/>
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<doc:lineage>New in EML 2.0</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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<xs:complexType>
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<xs:sequence>
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<xs:element name="attributeName" type="xs:string" maxOccurs="unbounded">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Attribute Name</doc:tooltip>
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<doc:summary>
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Name of an attribute found in the identified entity
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</doc:summary>
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<doc:description>
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Name of an attribute that can be found in the identified
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entity. This name will be unique within an entity and
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specifies that the attribute participates in the key that
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is being defined.
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</doc:description>
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<doc:example/>
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<doc:lineage>New in EML 2.0</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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<xs:element name="referencedEntityId" type="xs:string">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Referenced Entity ID</doc:tooltip>
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<doc:summary>
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The id of the parent-entity in a foreign key constraint.
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</doc:summary>
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<doc:description>
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This field contains the id of the entity to which a foreign key
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refers, otherwise known as the parent-entity or parent-table.
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This should be an identifer that matches one of the "identifier"
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elements for an entity that is linked into the package
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with a triple. The constraint document itself should be
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linked into the package as a member.
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</doc:description>
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<doc:example>
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knb.79.4
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</doc:example>
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<doc:lineage>
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New in EML 2.0
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</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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</xs:element>
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<xs:element name="referencedKey">
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<xs:annotation>
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<xs:appinfo>
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<doc:tooltip>Key</doc:tooltip>
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<doc:summary>
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The set of attributes to which a foreign key constraint refers.
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</doc:summary>
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<doc:description>
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The set of attributes to which a foreign key constraint refers.
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If the key refers to the primary key in the referenced entity,
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then the "referencedKey" is optional. For a foreign key, the
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set of attributes must match an identifying key in the
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referenced entity.
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</doc:description>
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<doc:example/>
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<doc:lineage>New in EML 2.0</doc:lineage>
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</xs:appinfo>
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</xs:annotation>
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<xs:complexType>
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373
|
<xs:sequence>
|
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374
|
<xs:element name="attributeName" type="xs:string" maxOccurs="unbounded">
|
|
375
|
<xs:annotation>
|
|
376
|
<xs:appinfo>
|
|
377
|
<doc:tooltip>Attribute Name</doc:tooltip>
|
|
378
|
<doc:summary>
|
|
379
|
Name of an attribute found in the identified entity
|
|
380
|
</doc:summary>
|
|
381
|
<doc:description>
|
|
382
|
Name of an attribute that can be found in the identified
|
|
383
|
entity. This name will be unique within an entity and
|
|
384
|
specifies that the attribute participates in the key that
|
|
385
|
is being defined.
|
|
386
|
</doc:description>
|
|
387
|
<doc:example/>
|
|
388
|
<doc:lineage>New in EML 2.0</doc:lineage>
|
|
389
|
</xs:appinfo>
|
|
390
|
</xs:annotation>
|
|
391
|
</xs:element>
|
|
392
|
</xs:sequence>
|
|
393
|
</xs:complexType>
|
|
394
|
</xs:element>
|
|
395
|
<xs:element name="relationshipType" minOccurs="0">
|
|
396
|
<xs:annotation>
|
|
397
|
<xs:documentation>
|
|
398
|
<doc:tooltip>Relationship type: Identifying or non-identifying</doc:tooltip>
|
|
399
|
<doc:summary>Relationship type: Identifying or non-identifying</doc:summary>
|
|
400
|
<doc:description>Identifying relationships propagate the the parent entity's
|
|
401
|
primary key to the child's primary key. Non-identifying relationships propagate the
|
|
402
|
parent's primary key as a non-key attribute of the child entity.
|
|
403
|
</doc:description>
|
|
404
|
<doc:example/>
|
|
405
|
<doc:lineage>New in EML 2.0</doc:lineage>
|
|
406
|
</xs:documentation>
|
|
407
|
</xs:annotation>
|
|
408
|
<xs:simpleType>
|
|
409
|
<xs:restriction base="xs:string">
|
|
410
|
<xs:enumeration value="identifying"/>
|
|
411
|
<xs:enumeration value="non-identifying"/>
|
|
412
|
</xs:restriction>
|
|
413
|
</xs:simpleType>
|
|
414
|
</xs:element>
|
|
415
|
<xs:element name="cardinality" minOccurs="0">
|
|
416
|
<xs:annotation>
|
|
417
|
<xs:documentation>
|
|
418
|
<doc:tooltip>Cardinality of the relationship between two entities. </doc:tooltip>
|
|
419
|
<doc:summary>Cardinality of the relationship between a parent entity and
|
|
420
|
a child entity.
|
|
421
|
</doc:summary>
|
|
422
|
<doc:description>Cardinality is a statement of the relationship between
|
|
423
|
parent and child entities. Cardinality is expressed as the ratio of
|
|
424
|
related parent and child entities. Cardinality 1 to N is a specific
|
|
425
|
form of cardinalty in which zero or one parent records are related
|
|
426
|
to a specified number of child records. The cardinality ratio for the
|
|
427
|
parent entity depends on whether the "existence" is mandatory (one or more)
|
|
428
|
or optional (zero to ...).
|
|
429
|
</doc:description>
|
|
430
|
<doc:example> One to many, One to 10, Zero or One to Many</doc:example>
|
|
431
|
<doc:lineage>New in EML 2.0</doc:lineage>
|
|
432
|
</xs:documentation>
|
|
433
|
</xs:annotation>
|
|
434
|
<xs:complexType>
|
|
435
|
<xs:sequence>
|
|
436
|
<xs:element name="parentOccurances">
|
|
437
|
<xs:annotation>
|
|
438
|
<xs:documentation>
|
|
439
|
<doc:tooltip>Parent portion of a 1 to exactly N cardinality </doc:tooltip>
|
|
440
|
<doc:summary>Parent portion of a 1 to exactly N cardinality.
|
|
441
|
May have a value of either 0 or 1.</doc:summary>
|
|
442
|
<doc:description> >Parent portion of a 1 to exactly N cardinality.
|
|
443
|
May have a value of either 0 or 1.
|
|
444
|
Value of 0 implies that the "existence" of a child record is optional.
|
|
445
|
Value of 1 implies that the "existence" of a child record is mandatory.
|
|
446
|
</doc:description>
|
|
447
|
<doc:example> One to 10, Zero or One to Many</doc:example>
|
|
448
|
<doc:lineage>New in EML 2.0</doc:lineage>
|
|
449
|
</xs:documentation>
|
|
450
|
</xs:annotation>
|
|
451
|
<xs:simpleType>
|
|
452
|
<xs:restriction base="xs:integer">
|
|
453
|
<xs:enumeration value="0"/>
|
|
454
|
<xs:enumeration value="1"/>
|
|
455
|
</xs:restriction>
|
|
456
|
</xs:simpleType>
|
|
457
|
</xs:element>
|
|
458
|
<xs:element name="childOccurances" type="CardinalityChildOccurancesType">
|
|
459
|
<xs:annotation>
|
|
460
|
<xs:documentation>
|
|
461
|
<doc:tooltip>Child portion of the cardinality expression </doc:tooltip>
|
|
462
|
<doc:summary>Child portion of a cardinality expression
|
|
463
|
Allowed values are positive integers including zero
|
|
464
|
or the string value "many".</doc:summary>
|
|
465
|
<doc:description> >Child portion of a cardinality expression
|
|
466
|
Allowed values are positive integers including zero
|
|
467
|
or the string value "many"</doc:description>
|
|
468
|
<doc:example> 2, 15, many </doc:example>
|
|
469
|
<doc:lineage>New in EML 2.0</doc:lineage>
|
|
470
|
</xs:documentation>
|
|
471
|
</xs:annotation>
|
|
472
|
</xs:element>
|
|
473
|
</xs:sequence>
|
|
474
|
</xs:complexType>
|
|
475
|
</xs:element>
|
|
476
|
</xs:sequence>
|
|
477
|
</xs:extension>
|
|
478
|
</xs:complexContent>
|
|
479
|
</xs:complexType>
|
|
480
|
</xs:element>
|
|
481
|
</xs:choice>
|
|
482
|
</xs:complexType>
|
|
483
|
<xs:simpleType name="CardinalityChildOccurancesType">
|
|
484
|
<xs:annotation>
|
|
485
|
<xs:documentation>
|
|
486
|
<doc:tooltip>Child portion of a cardinality expression </doc:tooltip>
|
|
487
|
<doc:summary>Child portion of a cardinality expression
|
|
488
|
Allowed values are positive integers including zero
|
|
489
|
or the string value "many".</doc:summary>
|
|
490
|
<doc:description>Child portion of a cardinality expression
|
|
491
|
Allowed values are positive integers including zero
|
|
492
|
or the string value "many" </doc:description>
|
|
493
|
<doc:example>0,1, 2, 15,many
|
|
494
|
</doc:example>
|
|
495
|
<doc:lineage>New in EML 2.0</doc:lineage>
|
|
496
|
</xs:documentation>
|
|
497
|
</xs:annotation>
|
|
498
|
<xs:union memberTypes="xs:integer">
|
|
499
|
<xs:simpleType>
|
|
500
|
<xs:restriction base="xs:string">
|
|
501
|
<xs:enumeration value="many"/>
|
|
502
|
</xs:restriction>
|
|
503
|
</xs:simpleType>
|
|
504
|
</xs:union>
|
|
505
|
</xs:simpleType>
|
|
506
|
</xs:schema>
|