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 minOccurs 1 in xsd? In general, an element is required to appearwhen the value of minOccurs is 1 or more.
What are minoccurs and maxoccurs?
Notice that the minOccurs and maxOccurs attributes are also used in the DTD declaration for an element element to specify the number of occurrences of an element. When working with DTDs, we used the markers *, ?, and + to indicate the number of times a particular child element could be used as content for an element.
What does the indicator mean?
The <maxOccurs> 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 is the default value for minoccurs?
The default for minOccurs is 0, but it's better to specify a value for it in your schema. The minOccurs and maxOccurs attributes can be set only to 0 or 1. For example, the following declaration makes the target attribute required:
What is the cardinality of maxoccurs in ASDF?
<xsd:element maxOccurs="2" name="asdf"/>. cardinality is [1-2] Note: if you specify only maxOccurs attribute, it can't be smaller than 1, because the default value for minOccurs is 1.
What is minOccurs 1 in XSD?
When "minOccurs=1" is contained within an XML Schema Definition (XSD), it means that the first occurrence of the element is required. The element does not need to contain any data, it just needs to be present.
What is Nillable true 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 simpleType and complexType in XSD?
XSD elements can be of type simpleType , complexType , or anyType . An element of type simpleType contains only text. It cannot have attributes and elements. An element of type complexType can contain text, elements, and attributes.
How many time and element can be appeared if minOccurs 1 and maxOccurs 0?
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 Nillable?
The nillable attribute specifies whether or not an explicit NULL value can be assigned to the element. True enables an instance of the element to have the NULL attribute set to true. The NULL attribute is defined as part of the XML Schema namespace for instances.
What is the default value of Nillable in XSD?
The default is false. If nillable is true, this enables an instance of the element to have the nil attribute set to true. The nil attribute is defined as part of the XML Schema namespace for instances.
What is maxOccurs unbounded?
The maximum number of times an element may appear is determined by the value of a maxOccurs attribute in its declaration. This value may be a positive integer such as 41, or the term unbounded to indicate there is no maximum number of occurrences.
What is annotation in XSD?
Definition and Usage The annotation element is a top level element that specifies schema comments. The comments serve as inline documentation.
What is XS sequence?
Purpose. This element (the "sequence" particle) is used for expressing sequences in the content model of a complex type used for element definitions. This means that the child elements must appear in a given order. Parent element.
Is maxOccurs unbounded insecure in XSD?
No. There's nothing inherently wrong with using maxOccurs="unbounded" in XSD.
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.
How many indicators are present in schema?
There are seven indicators: Order indicators: All. Choice.
What is Nillable false?
nillable="false" means you can't have the attribute xsi:nil="true". But you don't have this attribute so this won't make it invalid.
What is @XmlElement required true?
The @XmlElement(required=true) annotation specifies that an element must be present in the XML representation.
What is maxOccurs unbounded?
The maximum number of times an element may appear is determined by the value of a maxOccurs attribute in its declaration. This value may be a positive integer such as 41, or the term unbounded to indicate there is no maximum number of occurrences.
How do you represent null in XML?
In an XML document, the usual way to represent a null value is to leave the element or attribute empty. Some business messages use a special value to represent a null value:
All Indicator
The <all> indicator specifies that the child elements can appear in any order, and that each child element must occur only once:
Choice Indicator
The <choice> indicator specifies that either one child element or another can occur:
Sequence Indicator
The <sequence> indicator specifies that the child elements must appear in a specific order:
maxOccurs Indicator
The <maxOccurs> indicator specifies the maximum number of times an element can occur:
minOccurs Indicator
The <minOccurs> indicator specifies the minimum number of times an element can occur:
The minOccurs and maxOccurs attributes
Notice that the minOccurs and maxOccurs attributes are also used in the DTD declaration for an element element to specify the number of occurrences of an element. When working with DTDs, we used the markers *, ?, and + to indicate the number of times a particular child element could be used as content for an element.
The attribute Element
Attributes were declared in the simplified DTD in "A DTD for Schemas" as follows:
