Term	Description
XHTML	XHTML is a relatively new type of web programming language that enables a user to don the best attributes from HTML and XML. While HTML displays data, XML describes the data simplifying validation resulting in support for elimination of undesired events for users.\n\nXHTML stands for extensible hypertext markup language. It is a strict language based on HTML. Javascript can be used with XHTML as a complementary scripting language to create more interactive content. Main examples of javascript are interactive elements that are beyond the capabilities of HTML or XHTML including calculations or an img element that changes when pointed to.\n\nAll of the newest internet browsers support XHTML elements. Many web developers make simple mistakes in the validation of an HTML tag in the website header or fail to follow the basic HTML rules and guidelines. XHTML is more strict than HTML so it eliminates these problems making accessibility better for new devices including mobile phones that have difficulty interpreting contents or values in HTML tags that don’t follow the basic HTML rules.
XLS	Microsoft Excel spreadsheet format
XML	XML stands for extensible markup language which is an authoring tool for building documents and websites that makes it easy to exchange data over the internet. XML is a metalanguage designed to simplify implementation of elements in the main webpage architecture or in documents. The World Wide Web consortium recognizes HML as a formal specification. Thus, it is a core element for a system programming platform that aims to produce a doctype that''s search engine friendly. Users of XML find processing and validation to be easy.\n\nXML and HTML have recently been combined to produce XHTML which is a more modern programming language for the web. The basic components of XHTML are HTML which displays data and XML which describes data. The use of both, in the form of XHTML, diminishes the level of events where a browser would have difficulty interpreting an element in a tag. Xpath is a language that assists in searching an XML document for specific XML schemas and elements.