The XML is considered as the very special language which is capable to label the information content. The data from the structured and semi structured documents can be labeled in this way. The query languages are capable to display the intelligent use of these XML comfortably. In this way the queries can be employed across all sorts of data. The data which are physically stored in XML and stores as XML can be utilized in this way. The language which satisfies these specifications is generally known as XQuery languages. Thus these Query languages
XML is a markup language for structured documentation. Structured documents are documents that contain both content (words, pictures, etc.) and some indication of what role that content plays (for example, content in a section heading has a different meaning from content in a footnote, which means something different than content in a figure caption, etc.). Almost all documents have some structure.
A markup language is a mechanism to identify structures in a document. The XML specification defines a standard way of adding markup to documents.
So XML
Style sheets describe how documents are presented on screens, in print, or perhaps how they are pronounced. W3C has actively promoted the use of style sheets on the Web since the Consortium was founded in 1994. The Style Activity has produced several W3C Recommendations (CSS1, CSS2, XPath, XSLT). CSS especially is widely implemented in browsers.
By attaching style sheets to structured documents on the Web (e.g. HTML), authors and readers can influence the presentation of documents without sacrificing device-independence or adding new HTML
XML is a versatile markup language, capable of labeling the information content of diverse data sources including structured and semi-structured documents, relational databases, and object repositories. A query language that uses the structure of XML intelligently can express queries across all these kinds of data, whether physically stored in XML or viewed as XML via middleware. This specification describes a query language called XQuery, which is designed to be broadly applicable across many types of XML data sources.
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