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Why you should validate data on the server as well as the client
XML documents are made up of storage units called entities , which contain either parsed or unparsed data. Parsed data is made up of characters , some of which form character data , and some of which form markup. Markup encodes a description of the document's storage layout and logical structure. XML provides a mechanism to impose constraints on the storage layout and logical structure. A software module called an XML processor is used to read XML documents and provide access to their content and structure. It is assumed that an XML processor is doing its work on behalf of another module, called the application. The design goals for XML are: XML shall be straightforwardly usable over the Internet. XML shall support a wide variety of applications. It shall be easy to write programs which process XML documents. The number of optional features in XML is to be kept to the absolute minimum, ideally zero. XML documents should be human-legible and reasonably clear. The XML design should be prepared quickly. The design of XML shall be formal and concise. XML documents shall be easy to create. Terseness in XML markup is of minimal importance. This version of the XML specification may be distributed freely, as long as all text and legal notices remain intact. In addition, the terms defined in the following list are used in building those definitions and in describing the actions of an XML processor: A violation of the rules of this specification; results are undefined. After encountering a fatal error, the processor MAY continue processing the data to search for further errors and MAY report such errors to the application. In order to support correction of errors, the processor MAY make unprocessed data from the document with intermingled character data and markup available to the application. A rule which applies to all valid XML documents. A rule which applies to all well-formed XML documents. Violations of well-formedness constraints are fatal errors. Of strings or names: Two strings or names being compared are identical. No case folding is performed. Of strings and rules in the grammar: A string matches a grammatical production if it belongs to the language generated by that production. Of content and content models: An element matches its declaration when it conforms in the fashion described in the constraint [VC: A data object is an XML document if it is well-formed , as defined in this specification. In addition, the XML document is valid if it meets certain further constraints. Physically, the document is composed of units called entities. An entity may refer to other entities to cause their inclusion in the document. A document begins in a "root" or document entity. Logically, the document is composed of declarations, elements, comments, character references, and processing instructions, all of which are indicated in the document by explicit markup. The logical and physical structures MUST nest properly, as described in 4. A textual object is a well-formed XML document if: It meets all the well-formedness constraints given in this specification. Each of the parsed entities which is referenced directly or indirectly within the document is well-formed.
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