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In the head portion of your HTML, you should create a script to do the form validation: See the validation script in action.Page 4: Use a Perl CGI script to validate your HTML forms.Let's try out what we've covered so far by creating our own simple XML validation tool.To do this, we will need a sample XML file, a test script, and simple Perl "wrapper" script to allow our tool to validate more than a single type of document.In this article, I'm going to explain what I think are 'good practices' for dealing with version numbers in Perl.I'm going to point out what I think are 'bad practices'. B., the Perl Best Practices book is wrong)) In the end, I'm going to make some recommendations that I hope people will follow for their own sake and the sake of others who work with their code.ok(sub , 5, '2 and 2 is 4'); # this test fails for the obvious mathematical # reason and prints a descriptive error.will return the same nodes as the previous example, and bring all of the "bar" elements' descendants along for the ride.

It checks to see if the required fields are there, and if not, saves an error message into a variable for display: The difference with how the CGI writes the error message is that instead of a "\n", it uses the HTML paragraph tag to put a new line in between each error.In a perfect world, I would never blog about version numbers in Perl. No one should have to think about how they specify or check a version number.Perl programming makes things easy, not hard, right?XPath also provides a number of functions and shortcuts that further simplify examining a document's structure.For instance, 's compact syntax with the simple power of XPath expressions will allow us to tackle the task of validating an XML document simply and efficiently.