How do I make an XML element optional?
Add attribute minOccurs=”0″ on the element to make it optional.
Can XML elements be optional?
Defining XML Attributes Attributes are either optional or mandatory (by default they are optional). The “use” property in the XSD definition is used to specify if the attribute is optional or mandatory.
What is the requirement of XML schema?
The XML schema language must: provide for primitive data typing, including byte, date, integer, sequence, SQL & Java primitive data types, etc.; Conformance.
What is element in XML schema?
XML Schemas define the elements of your XML files. A simple element is an XML element that contains only text. It cannot contain any other elements or attributes.
What is optional element in XML?
Optional means that the field does not need to be present in the XML. You can have a field that is optional and required, meaning that if it is present in the XML then it must be filled in. To clarify: Optional: Does not need to be present in the XML.
Does XML support array?
xml file. When you want to add an extra item to your array, it will not affect the other array items and will remove sequencing complications with array items. but is also a best practice for handling string arrays for Android.
Is XML Schema required?
All XML documents must be well-formed, but it is not required that a document be valid unless the XML parser is “validating”, in which case the document is also checked for conformance with its associated schema. DTD-validating parsers are most common, but some support XML Schema or RELAX NG as well.
Why do we need XML Schema?
The purpose of an XML Schema is to define the legal building blocks of an XML document: the elements and attributes that can appear in a document. the number of (and order of) child elements. data types for elements and attributes.
What is XML element and attribute?
Attributes are part of XML elements. An element can have multiple unique attributes. Attribute gives more information about XML elements. To be more precise, they define properties of elements. An XML attribute is always a name-value pair.
What is schema element?
The schema element is the document element (the top-level element) in a schema definition. The namespaces specified using the xmlns attribute must include the namespace for the schema-defining elements and attributes (schema, element, and so on).
What is schema in XML example?
XML Schema is commonly known as XML Schema Definition (XSD). It is used to describe and validate the structure and the content of XML data. XML schema defines the elements, attributes and data types. Schema element supports Namespaces.
What does default mean in XML Schema element?
Default is false Optional. Specifies whether the element can be used in an instance document. True indicates that the element cannot appear in the instance document. Instead, another element whose substitutionGroup attribute contains the qualified name (QName) of this element must appear in this element’s place.
What does abstract mean in XML Schema element?
abstract. Optional. Specifies whether the element can be used in an instance document. True indicates that the element cannot appear in the instance document. Instead, another element whose substitutionGroup attribute contains the qualified name (QName) of this element must appear in this element’s place.
Are there any other XML Schema standards besides DTD?
XML Data Reduced (XDR) was an early attempt but Microsoft to provide a more comprehensive standard than DTD. This standard has been phased out in the Microsoft products in favour of XSD. There are also a number of other schema standards such as Schematron and RELAX NG.
Is the null attribute optional in XML Schema?
Optional. Specifies whether 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. Default is false.