Element
Schema is the root element of XSD and it is always required.
<xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema">
targetNamespace = "http://www.tutorialspoint.com"
The above fragment specifies that elements used in this schema are defined in http://www.tutorialspoint.com namespace. It is optional.
xmlns = "http://www.tutorialspoint.com"
The above fragment specifies that default namespace is http://www.tutorialspoint.com.
elementFormDefault = "qualified"
The above fragment indicates that any elements declared in this schema must be namespace qualified before using them in any XML Document.It is optional.
Verify the output
You’ll see the following result −
students.xml is valid against students.xsd
XSD — Simple Types
In this chapter, we’ll see Simple Types that XSD defines.
S.No. | Simple Type & Description |
---|---|
1 |
Simple Element can contain only text. It can not contain any other element. |
2 |
Attribute is itself a type and is used in Complex Element. |
3 |
Restriction defines the acceptable values of an XML element. |
XSD — Complex Types
Complex Element is an XML element which can contain other elements and/or attributes. We can create a complex element in two ways −
-
Define a complex type and then create an element using the type attribute
-
Define a complex type directly by naming
Define a Complex Type and then create an element using type attribute.
<xs:complexType name = "StudentType"> <xs:sequence> <xs:element name = "firstname" type = "xs:string"/> <xs:element name = "lastname" type = "xs:string"/> <xs:element name = "nickname" type = "xs:string"/> <xs:element name = "marks" type = "xs:positiveInteger"/> </xs:sequence> <xs:attribute name = 'rollno' type = 'xs:positiveInteger'/> </xs:complexType> <xs:element name = 'student' type = 'StudentType' />
Define a Complex Type directly by naming.
<xs:element name = "student"> <xs:complexType> <xs:sequence> <xs:element name = "firstname" type = "xs:string"/> <xs:element name = "lastname" type = "xs:string"/> <xs:element name = "nickname" type = "xs:string"/> <xs:element name = "marks" type = "xs:positiveInteger"/> </xs:sequence> <xs:attribute name = 'rollno' type = 'xs:positiveInteger'/> </xs:complexType> <xs:element>
Following is the list of Complex Types that XSD supports.
S.No. | Simple Type & Description |
---|---|
1 |
Complex Empty complex type element can only have attributes but no contents. |
2 |
Elements-Only complex type element can only contain elements |
3 |
Text-Only complex type element can only contain attribute and text. |
4 |
Mixed complex type element can contain element, attribute and text. |
5 |
Indicators controls the ways how elements are to be organized in an XML document. |
6 |
The <any> element is used for elements which are not defined by schema |
7 |
The <anyAttribute> attribute is used for attribute which are not defined by schema. |
String data types are used to represent characters in the XML documents.
Синтаксис minoccurs 0 в XML Schema
XML Schema является языком описания структуры документов в формате XML. Он позволяет определить набор правил и ограничений, которым должен соответствовать XML-документ. Одним из важных аспектов XML Schema является использование атрибута minoccurs, который определяет минимальное количество раз, которое элемент должен встречаться в документе.
Значение minoccurs может быть установлено в любое неотрицательное целое число или символ «unbounded». Оно указывает, сколько раз элемент должен быть представлен в документе. Значение «0» означает, что элемент может отсутствовать в документе.
Для определения атрибута minoccurs в XML Schema используется следующий синтаксис:
<xs:element name=»elementName» minoccurs=»0″>
<xs:complexType>
<xs:sequence>
<xs:element name=»childElement» type=»xs:string» />
</xs:sequence>
</xs:complexType>
</xs:element>
В приведенном выше примере элемент «elementName» может отсутствовать в документе. Если он присутствует, то должен быть представлен внутри элемента «complexType» и содержать элемент «childElement» со значением типа «xs:string».
Использование атрибута minoccurs с значением «0» позволяет создавать более гибкие XML-документы, в которых некоторые элементы являются необязательными и могут отсутствовать в документе без нарушения семантических правил. Это полезно в случаях, когда некоторые данные не всегда доступны или являются необязательными для обработки документа.
Важно отметить, что атрибут minoccurs не является обязательным и по умолчанию равен «1». Если значение атрибута minoccurs не указано или установлено в «1», то элемент должен быть присутствовать в документе как минимум один раз
В общем, использование атрибута minoccurs с значением «0» позволяет создавать более гибкие и масштабируемые схемы XML, которые могут адаптироваться к различным ситуациям и условиям использования. Это делает язык XML Schema очень мощным инструментом для описания структуры документов и обеспечивает их совместимость и удобство использования.
What is all in XSD?
Element Allows the elements in the group to appear (or not appear) in any order in the containing element.
What is the full form of XSD?
XSD (XML Schema Definition), a recommendation of the World Wide Web Consortium (W3C), specifies how to formally describe the elements in an Extensible Markup Language (XML) document.
What is minoccurs and maxoccurs in XSD?
What is minOccurs and maxOccurs in XSD? XML can contain an array with varying numbers of elements. The minOccurs attribute specifies the minimum number of times that the element can occur. It can have a value of 0 or any positive integer. The maxOccurs attribute specifies the maximum number of times that the element can occur.
What is min and maxoccurs in JavaScript?
The minOccurs attribute specifies the minimum number of times that the element can occur. It can have a value of 0 or any positive integer. The maxOccurs attribute specifies the maximum number of times that the element can occur. Click to see full answer.
What is the difference between minoccurs and useoccurs?
But “minOccurs” (along with “maxOccurs”) is used for element definition while “use” for attribute. The value of the minOccurs attribute is 0 means the element is optional. An element is required to appear when the value of minOccurs is 1 or more. Also value 1 is the default.
What does nillable mean in XSD?
The presence of the xsd:nillable attribute in an XSD element means that the corresponding element in the XML file permits null values. When an element in the XML file generated using that XSD has a null value, the xsi:nil=”true” attribute is set on that element.
индикатор Происшествие
Показатели Встречаемость используются для определения частоты элемента происходит.
Примечание: для всех и индикатора «Order» «Группа» (любой, все, выбор, последовательность , название группы и группы ссылка), которая MaxOccurs и MinOccurs по умолчанию равны 1.
индикатор MaxOccurs
Индикатор <MaxOccurs> можно указать максимальное количество раз может возникнуть элемент:
<xs:element name=»person»>
<xs:complexType>
<xs:sequence>
<xs:element name=»full_name» type=»xs:string»/>
<xs:element name=»child_name» type=»xs:string» maxOccurs=»10″/>
</xs:sequence>
</xs:complexType>
</xs:element>
Приведенные выше примеры показывают, что дочерний элемент «child_name» может появиться в наименьшего элемента «лицо» один раз (где по умолчанию значение MinOccurs равно 1), появляется в большинстве 10 раз.
индикатор MinOccurs
<MinOccurs> индикатор может потребоваться минимальное количество раз, то может возникнуть элемент:
<xs:element name=»person»>
<xs:complexType>
<xs:sequence>
<xs:element name=»full_name» type=»xs:string»/>
<xs:element name=»child_name» type=»xs:string»
maxOccurs=»10″ minOccurs=»0″/>
</xs:sequence>
</xs:complexType>
</xs:element>
Приведенные выше примеры показывают, что дочерний элемент «child_name» может быть минимум 0 в элементе «лицо», появляется не более 10 раз.
Совет: Для того, чтобы число вхождений элемента не ограничено, пожалуйста , используйте MaxOccurs = «неограниченную» это утверждение:
Практический пример:
Названный «Myfamily.xml» файл XML:
<?xml version=»1.0″ encoding=»ISO-8859-1″?>
<persons xmlns:xsi=»http://www.w3.org/2001/XMLSchema-instance»
xsi:noNamespaceSchemaLocation=»family.xsd»>
<person>
<full_name>Hege Refsnes</full_name>
<child_name>Cecilie</child_name>
</person>
<person>
<full_name>Tove Refsnes</full_name>
<child_name>Hege</child_name>
<child_name>Stale</child_name>
<child_name>Jim</child_name>
<child_name>Borge</child_name>
</person>
<person>
<full_name>Stale Refsnes</full_name>
</person>
</persons>
Выше этого XML-файл содержит корневой элемент с именем «лица» из. Внутри этого корневого элемента, мы определили три элемента «лицо». Каждый элемент «человек» должен содержать элементы «FULL_NAME», но он может содержать до 5 элемента «child_name».
Это файл схемы «family.xsd»:
<?xml version=»1.0″ encoding=»ISO-8859-1″?>
<xs:schema xmlns:xs=»http://www.w3.org/2001/XMLSchema»
elementFormDefault=»qualified»>
<xs:element name=»persons»>
<xs:complexType>
<xs:sequence>
<xs:element name=»person» maxOccurs=»unbounded»>
<xs:complexType>
<xs:sequence>
<xs:element name=»full_name» type=»xs:string»/>
<xs:element name=»child_name» type=»xs:string»
minOccurs=»0″ maxOccurs=»5″/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
Occurrence Indicators
Occurrence indicators are used to define how often an element can occur.
Note: For all «Order» and «Group» indicators (any, all, choice, sequence,
group name, and group reference) the default value for maxOccurs and minOccurs is 1.
maxOccurs Indicator
The <maxOccurs> indicator specifies the maximum number of times an element can occur:
<xs:element name=»person»>
<xs:complexType>
<xs:sequence>
<xs:element name=»full_name» type=»xs:string»/>
<xs:element name=»child_name» type=»xs:string» maxOccurs=»10″/>
</xs:sequence>
</xs:complexType>
</xs:element>
The example above indicates that the «child_name» element
can occur a minimum of one time (the default value for minOccurs
is 1) and a maximum of ten times in the «person» element.
minOccurs Indicator
The <minOccurs> indicator specifies the minimum number of times an element can occur:
<xs:element name=»person»>
<xs:complexType>
<xs:sequence>
<xs:element name=»full_name» type=»xs:string»/>
<xs:element name=»child_name» type=»xs:string»
maxOccurs=»10″ minOccurs=»0″/>
</xs:sequence>
</xs:complexType>
</xs:element>
The example above indicates that the «child_name» element can occur
a minimum of zero times and a maximum of ten times in the «person» element.
Tip: To allow an element to appear an unlimited number of times, use the maxOccurs=»unbounded»
statement:
A working example:
An XML file called «Myfamily.xml»:
<?xml version=»1.0″ encoding=»UTF-8″?>
<persons xmlns:xsi=»http://www.w3.org/2001/XMLSchema-instance»
xsi:noNamespaceSchemaLocation=»family.xsd»>
<person>
<full_name>Hege Refsnes</full_name>
<child_name>Cecilie</child_name>
</person>
<person>
<full_name>Tove Refsnes</full_name>
<child_name>Hege</child_name>
<child_name>Stale</child_name>
<child_name>Jim</child_name>
<child_name>Borge</child_name>
</person>
<person>
<full_name>Stale Refsnes</full_name>
</person>
</persons>
The XML file above contains a root element named «persons». Inside
this root element we have defined three «person» elements. Each «person» element must
contain a «full_name» element and it can contain up to five «child_name» elements.
Here is the schema file «family.xsd»:
<?xml version=»1.0″ encoding=»UTF-8″?>
<xs:schema xmlns:xs=»http://www.w3.org/2001/XMLSchema»
elementFormDefault=»qualified»>
<xs:element name=»persons»>
<xs:complexType>
<xs:sequence>
<xs:element name=»person» maxOccurs=»unbounded»>
<xs:complexType>
<xs:sequence>
<xs:element name=»full_name» type=»xs:string»/>
<xs:element name=»child_name» type=»xs:string»
minOccurs=»0″ maxOccurs=»5″/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
Order Indicators
Order indicators are used to define the order of the elements.
All Indicator
The <all> indicator specifies that the child elements can appear in any order, and that
each child element must occur only once:
<xs:element name=»person»>
<xs:complexType>
<xs:all>
<xs:element name=»firstname» type=»xs:string»/>
<xs:element name=»lastname» type=»xs:string»/>
</xs:all>
</xs:complexType>
</xs:element>
Note: When using the <all> indicator you can set the <minOccurs>
indicator to 0 or 1 and the <maxOccurs> indicator can only be set to 1 (the <minOccurs>
and <maxOccurs> are described later).
Choice Indicator
The <choice> indicator specifies that either one child element or another can occur:
<xs:element name=»person»>
<xs:complexType>
<xs:choice>
<xs:element name=»employee» type=»employee»/>
<xs:element name=»member» type=»member»/>
</xs:choice>
</xs:complexType>
</xs:element>
Sequence Indicator
The <sequence> indicator specifies that the child elements must appear in a specific order:
<xs:element name=»person»>
<xs:complexType>
<xs:sequence>
<xs:element name=»firstname» type=»xs:string»/>
<xs:element name=»lastname» type=»xs:string»/>
</xs:sequence>
</xs:complexType>
</xs:element>
индикатор заказа
Индикаторы заказа используются для определения порядка элементов.
Все отображаемые на дисплее
<Все> Индикатор в соответствии с положениями подэлементам могут появляться в любом порядке, и каждый дочерний элемент должен появиться только один раз:
<xs:element name=»person»>
<xs:complexType>
<xs:all>
<xs:element name=»firstname» type=»xs:string»/>
<xs:element name=»lastname» type=»xs:string»/>
</xs:all>
</xs:complexType>
</xs:element>
Примечание: При использовании индикатора <все>, вы можете положить <MinOccurs> установлено значение 0 или 1, но только индикатор <MaxOccurs> устанавливается равным 1 (позже объяснить <MinOccurs> и <MaxOccurs>).
Выбор индикатора
<Выбор> Индикатор обеспечивает подэлемента происходит или может произойти еще один дочерний элемент (или другой):
<xs:element name=»person»>
<xs:complexType>
<xs:choice>
<xs:element name=»employee» type=»employee»/>
<xs:element name=»member» type=»member»/>
</xs:choice>
</xs:complexType>
</xs:element>
Индикатор чередования фаз
<Последовательность> дочерний элемент должен быть указан в определенном порядке:
<xs:element name=»person»>
<xs:complexType>
<xs:sequence>
<xs:element name=»firstname» type=»xs:string»/>
<xs:element name=»lastname» type=»xs:string»/>
</xs:sequence>
</xs:complexType>
</xs:element>
What does minOccurs mean?
But “minOccurs” (along with “maxOccurs”) is used for element definition while “use” for attribute. The value of the minOccurs attribute is 0 means the element is optional. An element is required to appear when the value of minOccurs is 1 or more. Also value 1 is the default.
How can be defined within an XSD?
Defining XML Elements Each element definition within the XSD must have a ‘name’ property, which is the tag name that will appear in the XML document. The ‘type’ property provides the description of what type of data can be contained within the element when it appears in the XML document.
What Ismaxoccurs means in XSD?
The maxOccurs attribute specifies the maximum number of times that the element can occur. This is specified by setting the maxOccurs attribute of the “item” element to “unbounded” which means that there can be as many occurrences of the “item” element as the author wishes. Notice that the “note” element is optional.
What is the use of minOccurs in XSD?
An array with a varying number of elements is represented in the XML schema by using the minOccurs and maxOccurs attributes on the element declaration: The minOccurs attribute specifies the minimum number of times that the element can occur. It can have a value of 0 or any positive integer.
Can we generate XSD from XML?
The XML editor lets you create an XML Schema definition language (XSD) schema from an XML document. If the XML document has no schema or Document Type Definition (DTD) associated with it, the data in the XML document is used to infer a new XML Schema.
What is Nillable in XSD?
The nillable attribute can be defined on an xsd:element within an XML schema. It specifies that the xsi:nil attribute is valid for the element. If an XML schema has defined the nillable attribute as true, it is mapped as a required attribute and is included in the document, however, its values are nullified.
What is a XSD file?
XSD (XML Schema Definition) is a World Wide Web Consortium (W3C) recommendation that specifies how to formally describe the elements in an Extensible Markup Language (XML) document. XSD can also be used for generating XML documents that can be treated as programming objects.
What is complexType in xsd?
The complexType element defines a complex type. A complex type element is an XML element that contains other elements and/or attributes.
What is the default value for minoccurs in XSD?
The default value for both the minOccurs and the maxOccurs attributes is 1. Thus, when an element such as comment is declared without a maxOccurs attribute, the element may not occur more than once. What is XSD sequence?
What does maxoccurs mean in XML schema indicator?
The indicator specifies the maximum number of times an element can occur: The example above indicates that the “child_name” element can occur a minimum of one time (the default value for minOccurs is 1) and a maximum of ten times in the “person” element.
What’s the default value for the minoccurs attribute?
The default value for both the minOccurs and the maxOccurs attributes is 1. Thus, when an element such as comment is declared without a maxOccurs attribute, the element may not occur more than once.
XML Schema курс
XML Schema курсXML Schemas Краткое введениеXML Schema почемуXML Schema Как использоватьXML schema элементXSD Простые элементыXML Schema свойствоXML Schema ограниченной FacetsXML Schema Составной элементXML Schema Композитный пустой элементXML Schema Составной тип — Содержит только элементыXML Schema Составной элемент — Текст толькоXML Schema Составной тип — Смешанный СодержаниеXML Schema индикаторXML Schema any элементXML Schema anyAttribute элементXML Schema замещаемые элементыXML Schema примеровXML Schema Тип данных СтрокаXML Schema Дата / время типы данныхXML Schema Числовые типы данныхXML Schema Типы данных РазноеXML редакторXML Schema резюме
Syntax
The basic syntax of a XSD is as follows −
<?xml version = "1.0"?> <xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema"> targetNamespace = "http://www.tutorialspoint.com" xmlns = "http://www.tutorialspoint.com" elementFormDefault = "qualified"> <xs:element name = 'class'> <xs:complexType> <xs:sequence> <xs:element name = 'student' type = 'StudentType' minOccurs = '0' maxOccurs = 'unbounded' /> </xs:sequence> </xs:complexType> </xs:element> <xs:complexType name = "StudentType"> <xs:sequence> <xs:element name = "firstname" type = "xs:string"/> <xs:element name = "lastname" type = "xs:string"/> <xs:element name = "nickname" type = "xs:string"/> <xs:element name = "marks" type = "xs:positiveInteger"/> </xs:sequence> <xs:attribute name = 'rollno' type = 'xs:positiveInteger'/> </xs:complexType> </xs:schema>
Group Indicators
Group indicators are used to define related sets of elements.
Element Groups
Element groups are defined with the group declaration, like this:
<xs:group name=»groupname»>
…
</xs:group>
You must define an all, choice, or sequence element inside the group
declaration. The following example defines a group named «persongroup», that
defines a group of elements that must occur in an exact sequence:
<xs:group name=»persongroup»>
<xs:sequence>
<xs:element name=»firstname» type=»xs:string»/>
<xs:element name=»lastname» type=»xs:string»/>
<xs:element name=»birthday» type=»xs:date»/>
</xs:sequence>
</xs:group>
After you have defined a group, you can reference it in another definition, like this:
<xs:group name=»persongroup»>
<xs:sequence>
<xs:element name=»firstname» type=»xs:string»/>
<xs:element name=»lastname» type=»xs:string»/>
<xs:element name=»birthday» type=»xs:date»/>
</xs:sequence>
</xs:group>
<xs:element name=»person» type=»personinfo»/>
<xs:complexType name=»personinfo»>
<xs:sequence>
<xs:group ref=»persongroup»/>
<xs:element name=»country» type=»xs:string»/>
</xs:sequence>
</xs:complexType>
Attribute Groups
Attribute groups are defined with the attributeGroup declaration, like this:
<xs:attributeGroup name=»groupname»>
…
</xs:attributeGroup>
The following example defines an attribute group named «personattrgroup»:
<xs:attributeGroup name=»personattrgroup»>
<xs:attribute name=»firstname» type=»xs:string»/>
<xs:attribute name=»lastname» type=»xs:string»/>
<xs:attribute name=»birthday» type=»xs:date»/>
</xs:attributeGroup>
After you have defined an attribute group, you can reference it in another definition, like this:
<xs:attributeGroup name=»personattrgroup»>
<xs:attribute name=»firstname» type=»xs:string»/>
<xs:attribute name=»lastname» type=»xs:string»/>
<xs:attribute name=»birthday» type=»xs:date»/>
</xs:attributeGroup>
<xs:element name=»person»>
<xs:complexType>
<xs:attributeGroup ref=»personattrgroup»/>
</xs:complexType>
</xs:element>
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Referencing Schema
Take a look at the following Referencing Schema −
<?xml version = "1.0"?> <class xmlns = "http://www.tutorialspoint.com" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://www.tutorialspoint.com student.xsd"> <student rollno = "393"> <firstname>Dinkar</firstname> <lastname>Kad</lastname> <nickname>Dinkar</nickname> <marks>85</marks> </student> <student rollno = "493"> <firstname>Vaneet</firstname> <lastname>Gupta</lastname> <nickname>Vinni</nickname> <marks>95</marks> </student> <student rollno = "593"> <firstname>Jasvir</firstname> <lastname>Singh</lastname> <nickname>Jazz</nickname> <marks>90</marks> </student> </class>
xmlns = "http://www.tutorialspoint.com"
The above fragment specifies default namespace declaration. This namespace is used by the schema validator check that all the elements are part of this namespace. It is optional.
xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://www.tutorialspoint.com student.xsd">
After defining the XMLSchema-instance xsi, use schemaLocation attribute. This attribute has two values, namespace and location of XML Schema, to be used separated by a space. It is optional.
students.xml
<?xml version = "1.0"?> <class> <student rollno = "393"> <firstname>Dinkar</firstname> <lastname>Kad</lastname> <nickname>Dinkar</nickname> <marks>85</marks> </student> <student rollno = "493"> <firstname>Vaneet</firstname> <lastname>Gupta</lastname> <nickname>Vinni</nickname> <marks>95</marks> </student> <student rollno = "593"> <firstname>Jasvir</firstname> <lastname>Singh</lastname> <nickname>Jazz</nickname> <marks>90</marks> </student> </class>
students.xsd
<?xml version = "1.0"?> <xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema"> <xs:element name = 'class'> <xs:complexType> <xs:sequence> <xs:element name = 'student' type = 'StudentType' minOccurs = '0' maxOccurs = 'unbounded' /> </xs:sequence> </xs:complexType> </xs:element> <xs:complexType name = "StudentType"> <xs:sequence> <xs:element name = "firstname" type = "xs:string"/> <xs:element name = "lastname" type = "xs:string"/> <xs:element name = "nickname" type = "xs:string"/> <xs:element name = "marks" type = "xs:positiveInteger"/> </xs:sequence> <xs:attribute name = 'rollno' type = 'xs:positiveInteger'/> </xs:complexType> </xs:schema>
XSDValidator.java
import java.io.File; import java.io.IOException; import javax.xml.XMLConstants; import javax.xml.transform.stream.StreamSource; import javax.xml.validation.Schema; import javax.xml.validation.SchemaFactory; import javax.xml.validation.Validator; import org.xml.sax.SAXException; public class XSDValidator { public static void main(String[] args) { if(args.length !=2){ System.out.println("Usage : XSDValidator <file-name.xsd> <file-name.xml>" ); } else { boolean isValid = validateXMLSchema(args,args); if(isValid){ System.out.println(args + " is valid against " + args); } else { System.out.println(args + " is not valid against " + args); } } } public static boolean validateXMLSchema(String xsdPath, String xmlPath){ try { SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); Schema schema = factory.newSchema(new File(xsdPath)); Validator validator = schema.newValidator(); validator.validate(new StreamSource(new File(xmlPath))); } catch (IOException e){ System.out.println("Exception: "+e.getMessage()); return false; } catch(SAXException e1){ System.out.println("SAX Exception: "+e1.getMessage()); return false; } return true; } }
What does minOccurs mean in XSD?
The minOccurs attribute specifies the minimum number of times that the element can occur. It can have a value of 0 or any positive integer. The maxOccurs attribute specifies the maximum number of times that the element can occur.
What is the default value of minOccurs in XSD?
1
The default value for both the minOccurs and the maxOccurs attributes is 1. Thus, when an element such as comment is declared without a maxOccurs attribute, the element may not occur more than once.
What is XS sequence?
xs:sequence specifies that the child elements must appear in a sequence. See more info at http://www.w3.org/TR/xmlschema11-1/#element-sequence. Figure. xs:choice. xs:choice allows only one of the elements contained in the declaration to be present within the containing element.
What is the purpose of schema Mcq?
The purpose of an XML schema is to define the building blocks of an XML document.
What is XSD sequence?
xsd:sequence – “child elements must appear in a sequence. Each child element can occur from 0 to any number of times” (ie, maxOccurs can be 0 or any number or ‘unbounded’)
What is sequence in WSDL?
The sequence element specifies that the child elements must appear in a sequence. Each child element can occur from 0 to any number of times.