Selective Dissemination of Information
Selective dissemination of information (“SDI”) was originally a phrase related to library and information science. SDI refers to tools and resources used to keep a user informed of new resources on specified topics, including the current-awareness services used to inform about new library acquisitions.
SDI services pre-date the World Wide Web, and the term itself is somewhat dated. Contemporary analogous systems for SDI services include alerts, current awareness tools or trackers. These systems provide automated searches that inform the user of the availability of new resources meeting the user’s specified keywords and search parameters. Alerts can be received a number of ways, including
- RSS feeds,
- voice mail,
- Instant messaging,
- text messaging.
World Wide Web (WWW)
- World Wide Web (WWW), byname the Web, the leading information retrieval service of the Internet (the worldwide computer network). The Web gives users access to a vast array of documents that are connected to each other by means of hypertext or hypermedia links—i.e., hyperlinks, electronic connections that link related pieces of information in order to allow a user easy access to them.
- Hypertext allows the user to select a word or phrase from text and thereby access other documents that contain additional information pertaining to that word or phrase. Hypermedia documents feature links to images, sounds, animations, and movies.
- The Web operates within the Internet’s basic client-server format; servers are computer programs that store and transmit documents to other computers on the network when asked to, while clients are programs that request documents from a server as the user asks for them. Browser software allows users to view the retrieved documents.
- A hypertext document with its corresponding text and hyperlinks is written in HyperText Markup Language (HTML) and is assigned an online address called a Uniform Resource Locator (URL).
Electronic mail (email or e-mail) is a method of exchanging messages (“mail”) between people using electronic devices. Email was thus conceived as the electronic (digital) version of, or counterpart to, mail, at a time when “mail” meant only physical mail (hence e- + mail). Email later became a ubiquitous (very widely used) communication medium, to the point that in current use, an email address is often treated as a basic and necessary part of many processes in
entertainment, and other spheres of daily life in most countries. Email is the medium, and each message sent therewith is called an email (mass/count distinction).
Email operates across computer networks, primarily the Internet, and also local area networks. Today’s email systems are based on a store-and-forward model. Email servers accept, forward, deliver, and store messages. Neither the users nor their computers are required to be online simultaneously; they need to connect, typically to a mail server or a webmail interface to send or receive messages or download it.
RSS stands for Really Simple Syndication, and it’s is a simple, standardized content distribution method that can help you stay up-to-date with your favorite newscasts, blogs, websites, and social media channels. Instead of visiting sites to find new posts or subscribing to sites to receive notification of new posts, find the RSS feed on a website and read new posts in an RSS reader.
How RSS Works
- RSS is a way for website authors to publish notifications of new content on their website. This content may include newscasts, blog posts, weather reports, and podcasts.
- To publish these notifications, the website author creates a text file with the XML file extension for the RSS feed that contains the title, description, and link for each post on the site. Then, the website author uses this XML file to add an RSS feed to web pages on the site. The XML file automatically syndicates new content through this RSS feed in a standard format that displays in any RSS reader.
- When website visitors subscribe to this RSS feed, they read the new website content in an RSS reader. These RSS readers collect content from multiple XML files, organize the information, and display the content in one application.
There’s a lot you can do with an RSS feed and an RSS reader. Here are just a few examples:
- Follow discussions on web pages and in forums without visiting each page to read the list of posted comments.
- Keep up-to-date on the tasty foods your favorite bloggers dish up and share recipes with your friends.
- Stay current with local, national, and international news from several sources.
What Is an RSS Feed?
An RSS feed consolidates information sources in one place and provides updates when a site adds new content. With social media, all you see is the favorite stuff that people share. With an RSS feed, you see everything a website publishes.
To find an RSS feed on a website, look on the site’s main or home page. Some sites display their RSS feed as an orange button that may contain the acronyms RSS or XML.
- A voicemail system (also known as voice message or voice bank) is a computer-based system that allows users and subscribers to exchange personal voice messages; to select and deliver voice information; and to process transactions relating to individuals, organizations, products, and services, using an ordinary phone.
- The term is also used more broadly to denote any system of conveying a stored telecommunications voice messages, including using an answering machine. Most cell phone services offer voicemail as a basic feature; many corporate private branch exchanges include versatile internal voice-messaging services, and *98 vertical service code subscription is available to most individual and small business landline subscribers (in the US).
Text messaging, or texting, is the act of composing and sending electronic messages, typically consisting of alphabetic and numeric characters, between two or more users of mobile devices, desktops/laptops, or another type of compatible computer. Text messages may be sent over a cellular network, or may also be sent via an Internet connection.