Static image or Animated image.

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PHP (Hypertext Preprocessor) is an open source, server-side, HTML embedded scripting language used to create dynamic Web pages. PHP script is embedded within a HTML document and the programmer can jump between HTML and PHP seamlessly within the document while the code remains inaccessible to users since it is processed on the server. It combines the power of CGI scripting with the ease of working within HTML.

PHP offers several key advantages:

• Cross-platform operability
• Compatibility with a wide variety of databases
• Support for most current web servers
• Communicates with numerous network protocols
• Not limited to HTML output Assuming you have an operating system and Web server setup on your server, PHP installation is fairly easy. Essentially you need to install the PHP processor and have your server associate .php files with it. PHP.net has detailed installation instructions for UNIX/Linux, Windows, and Mac OS on its Web site

Once you have PHP installed, all you need to do is place your php files in your Web directories and the server will automatically parse them when someone points their web-browser to that page.

XML signatures are digital signatures designed for use in XML transactions. The standard defines a schema for capturing the result of a digital signature operation applied to arbitrary (but often XML) data. Like non-XML-aware digital signatures (e.g., PKCS), XML signatures add authentication, data integrity, and support for non-repudiation to the data that they sign. However, unlike non-XML digital signature standards, XML signature has been designed to both account for and take advantage of the Internet and XML.

A fundamental feature of XML Signature is the ability to sign only specific portions of the XML tree rather than the complete document. This will be relevant when a single XML document may have a long history in which the different components are authored at different times by different parties, each signing only those elements relevant to itself. This flexibility will also be critical in situations where it is important to ensure the integrity of certain portions of an XML document, while leaving open the possibility for other portions of the document to change. Consider, for example, a signed XML form delivered to a user for completion. If the signature were over the full XML form, any change by the user to the default form values would invalidate the original signature.

An XML signature can sign more than one type of resource. For example, a single XML signature might cover character-encoded data (HTML), binary-encoded data (a JPG), XML-encoded data, and a specific section of an XML file.

Signature validation requires that the data object that was signed be accessible. The XML signature itself will generally indicate the location of the original signed object. This reference can

• be referenced by a URI within the XML signature;
• reside within the same resource as the XML signature (the signature is a sibling);
• be embedded within the XML signature (the signature is the parent);
• have its XML signature embedded within itself (the signature is the child).

XHTML: eXtensible HyperText Markup Language. XHTML 1.0 is the first document type in the XHTML family. It is a reformulation of the three HTML 4 document types as applications of XML. It is intended to be used as a language for content that is both XML-conforming and, if some simple guidelines are followed, operates in HTML 4 conforming user agents. (W3C)

• CSS: Cascading Style Sheets. A simple mechanism for adding style (e.g. fonts, colors, spacing) to Web documents.
• DHTML: Dynamic HyperText Markup Language. Combines HTML, style sheets, and scripts to make Web pages dynamic or interactive.

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