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Posted by / 18-Oct-2019 10:39

Validating xpath

XPath, the XML Path Language, is a query language for selecting nodes from an XML document.

In addition, XPath may be used to compute values (e.g., strings, numbers, or Boolean values) from the content of an XML document.

XPath was defined by the World Wide Web Consortium (W3C).

The XPath language is based on a tree representation of the XML document, and provides the ability to navigate around the tree, selecting nodes by a variety of criteria.

Now I want to check against the schema whether the xpath is valid (to the schema) or if it's not. That's why I posted that (maybe stupid) question into this forums - Thomas -Could you explain the criteria based on which a given XPath expression is considered to be valid or invalid? But this requirements were given me by my manager Ok, will sleep on this and post if I have any good thoughts... (meaning XPath from the Root node) or will it be a partial XPath ?

The first way is to validate the XML content using a validating Xml Reader object and the second way is to use the Validate method of the Xml Document class. An Xml Schema Exception will be thrown when an attribute or element with Typed Value set to is accessed by the XPath Navigator. The following example validates the file as it is loaded into the Xml Document object by creating the Xml Document object using a validating Xml Reader object.

Hover your mouse over the MRI bookmarklet on IE browser and observe that the Java Script code which is helping us in validating the XPath Expressions and CSS Selectors locators will be displayed as shown below: Conclusion MRI is nothing but a bookmarklet containing the Java Script code for validating the XPath Expressions and CSS Selectors locators in Internet Explorer Browser.

If you requirement is to validate the XPath Expressions and CSS Selectors Locators in Internet Explorer browser, blindly use MRI bookmarklet.

Auto generation of locators is out of scope using MRI. Now type the XPath Expression of 'Selenium143' link say "//a[@id='link1']" into the text box field in MRI pop-up and click on 'MRI' button as shown below: Note: On clicking the 'MRI' button after providing the Xpath Expression, the 'Selenium143' related to the provided Xpath Expression gets highlighted on the page as shown below: Hence we have validated whether the provided Xpath Expression is locating the required GUI element. Similarly we can validate the CSS Selector of 'Selenium143' link i.e.

'#link1' using MRI as shown below: Hence we have validated whether the provided CSS Selector is locating the required GUI element. Now we have understood using MRI in Internet Explorer browser, lets find out how does the MRI bookmarklet is able to validate the XPath Expressions and CSS Selectors in Internet Explorer Browser.

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It only verifies that the XML document is well formed. Message) End Try End Sub Shared Sub Schema Validation Handler(By Val sender As Object, By Val e As Validation Event Args) Select Case e. This means that the Is Empty Element property always returns The Validate method of the Xml Document class validates the XML document contained in an Xml Document object against the schemas specified in the Xml Document object's Schemas property and performs infoset augmentation. XPath Class Validate Example Shared Sub Main(By Val args() As String) Dim document As Xml Document = New Xml Document() document. Add(" "contoso Books.xsd") Dim validation As Validation Event Handler = New Validation Event Handler(Address Of Schema Validation Handler) document. The first modification inserts an invalid child element resulting in a schema validation error, and the second modification sets the value of a typed node to a value that is invalid according to the type of the node resulting in an exception.