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Abstract Schematron [Schematron] is a structural based validation language, defined by Rick Jelliffe, as an alternative to existing grammar based approaches.Tree patterns, defined as XPath expressions, are used to make assertions, and provide user-centred reports about XML documents.Schematron is a useful and accessible supplement to other schema languages.The open-source XSLT implementation is based around a core framework which is open for extension and customisation.Although there are strong outward similarities between Java Script and Java, including language name, syntax, and respective standard libraries, the two languages are distinct and differ greatly in design; Java Script was influenced by programming languages such as Self and Scheme.In 1993, the National Center for Supercomputing Applications (NCSA), a unit of the University of Illinois at Urbana-Champaign, released NCSA Mosaic, the first popular graphical Web browser, which played an important part in expanding the growth of the nascent World Wide Web.You can then adapt this form to your own requirements.Let's build a simple form with a validation script.

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Tree patterns are collected together to form a Schematron schema.

Form validation is the process of checking that a form has been filled in correctly before it is processed.

For example, if your form has a box for the user to type their email address, you might want your form handler to check that they've filled in their address before you deal with the rest of the form.

It has an API for working with text, arrays, dates, regular expressions, and basic manipulation of the DOM, but does not include any I/O, such as networking, storage, or graphics facilities, relying for these upon the host environment in which it is embedded.

Initially only implemented client-side in web browsers, Java Script engines are now embedded in many other types of host software, including server-side in web servers and databases, and in non-web programs such as word processors and PDF software, and in runtime environments that make Java Script available for writing mobile and desktop applications, including desktop widgets.