What is xsd validation

Thanks for reading this article. Please share your valuable feedback and comments. View All. Sagar Shinde Updated date Nov 28, What is XML? Why is it necessary to validate XML? How to validate XML? Here, XSD validates all the sub-child elements under a parent element, in sequence. We explain more about these restrictions in the below implementation.

It qualifies element names uniquely on the web in order to avoid conflicts between elements with the same name. Indicates that any elements used by the XML instance document that were declared in this schema must be namespace-qualified. By namespace-qualified, we mean the target namespace specified, applies to elements in the schema complaint XML document.

Event ID can be of type xs:integer where the minimum value is 0 and the maximum value is unbounded. To validate it, we create a xs:simpleType validation with restrictions on the data type and the boundary values. In this XML schema, certain tags holds only textual data with no restrictions on its length or format, so the data type must of xs:string. This input field accepts the tags related to the events as comma separated values in lower case.

Here, we set a restriction on the number of occurrences to 5 This is an arbitrary value. We also validate the attributes present inside the element, using XSD validation for attributes. The code above validates the tagsType as a complex type with a sequence containing 5 other sub-elements of name tag. These elements also contains attributes like id and displayName. So, we also validate the possible values of the attribute id , where the expected data type must be xs:string.

To validate them, we can specify restrictions based on the data types, and their possible binary choices. A complex element with specific element values is called an attribute.

When specifying attributes, an element is considered to be a complex element. When only one element is needed to be validated, we can validate it under XSD tag xs:simpleType.

However, when a group or series of elements are to be verified, we can specify it under xs:complexType. An extensible markup language namespace is a collection of names that can be used as elements or attributes in XML files. NET displays a new file named Module1. At the beginning of this file, add two Imports statements, as follows:. In Module1 before the start of the Main subroutine , declare a boolean variable named isValid, as follows:. Set this property to DTD, as follows:. If any validation errors occur, the validating reader generates a validation event.

Add the following code to register a validation event handler you will implement the MyValidationEventHandler subroutine in step 8 of this section :. Add the following code to read and validate the XML document. If any validation errors occur, MyValidationEventHandler will be called to handle the error. This subroutine will set isValid to False see step 8 of this section.

You can check the status of isValid after validation to see whether the document is valid or invalid. The application should report that the XML document is valid.

Run the application again. Validation event Element 'Product' has incomplete content. Expected 'ProductName'. Document is invalid. Declare a default namespace, urn:MyNamespace , in the document.

Open Product.