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Unique
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XSD Editor > Graphical Notation Overview > Unique

Glossary Item Box

Graphical Representation

Unique Notation

Summary

The <unique> element defines a key that unambiguously identifies an element within the XML Document.

Creating

A <unique> can only be added to an element object. This can be done using the right click context menu on any of these entities.

Properties

Unique Properties

Name - the name of the key.
XPath Fields - 1 or more XPath expressions that uniquely identify selected element.
XPath Selector - The XPath expression that identifies the element to which this key applies.
Id - A user defined ID to uniquely identify the entity within the schema

Sample

The following XSD code


<?
xml version="1.0" encoding="utf-8" ?>


<
xs:schema elementFormDefault="qualified" xmlns:xs=http://www.w3.org/2001/XMLSchema>


<
xs:element name="Library">


<
xs:complexType>


<
xs:sequence>


<
xs:element name="Book">


<
xs:complexType>


<
xs:sequence>


<
xs:element name="Title" type="xs:string" />


</
xs:sequence>


<
xs:attribute name="ISBN" type="xs:string" />


</
xs:complexType>


</
xs:element>


</
xs:sequence>


</
xs:complexType>


<
xs:unique name="BookReference">


<
xs:selector xpath="Book" />


<
xs:field xpath="@ISBN" />


</
xs:unique>


</
xs:element>


</
xs:schema>

 

Will be represented like this

Unique Samples

ShowInline Properties

Properties that apply to a type are shown inline at the bottom of the items container.

Values that are inherited from the base types are shown in brackets, values specifically set against the item are shown without brackets.

If a facet is not valid for a given type (typically because of its data type), then its value is shown in red.

Inline properties can be disabled in the Options.