A mark up text, won´t look like the text we usually see in a book or magazine. This texts use their own specific language calles markup language. This language uses an specific structure or syntax that differs from the one we are used to use. In another words, this language gives us the content of the text, what it says and means, separates from what we want it to look like, for that we use style sheets. This mark up languages are also used by editors whenever they want to make annotations or references to the text. For example,if we are using the mark up language called HTML, the title of a text is going to have the word title written in between laces(><) that contain the information we want to write. Those tags give us the information of the way that texts is writen, either in bold, including an image, a quote,… we have the initial tag with attributes that specify what we want, the text we wrote and the ending tag with the same attributes as the begining tag. All these information together creates one element.
In this case while we write this blog we are using HTML language, sometimes we don´t realize about it, whenever we introduce a link, a quote, a title,…We know how to identify them because they are different and that´s what HTML does, gove the web page the information it needs to create what we are asking it to do.
RDF:
The Resource Description Framework or RDF is a framework created by W3C in the World Wide Web. It was originated by Ramanathan V. Guha when he worked in Apple computers and at the time he called this sistem MCF.
This system makes statements of the resources we are using. It uses triples to show this statements. This triples are more commonly known as subject-predicate-object expressions, like in the analysis of regular texts. This model is based in the resource declaration with the subject and predicate form. The subject is the source while the predicate acts as the property or relation that is wanted to stablish about the source. To conclude the object is the value of the property that stablishes the relation between subject and predicate;saying it in another way, the subjects gives us the source while the predicates denotes aspects that relate our object, at the same time our object makes the connection between the subject and the predicate.
RDF like lots of markup languages doesn´t have a direct ancestor, before it, the closest system found related to it in a way, it is MCF. RDF was set as reccommendation status in 1999 along with XML. There were some updates to make of course in 2004 there was released some specifications, but even though with this new set of reccomendations W3C gathered in June 2010, to make more improvements and create a new update to RDF.
SGML:
SGML or Standard Generalized Markup Language is an organization and tagging system for documents formalized by the ISO in 1986. It is also denominates a metalaguage from where HTML and XML derive. Its antecesor was created in the 60′s by 3 men that convining their last ame’s initials they created GML. They worked for IBM. Originally it was created to enable decides that could read that information and probably steal it since it was used by the government, law, and industroies, and often by the military too.
When SGML was created it was made with 2 basic ideas. The creators of it thought that markups were only used to show structure and other characteristics of the text, not the steps or procces to be followed. They also wantes a strong and severe markup so that the created databases could be used also to process other documents. There markups should be used used once and the system should remember the usage of these instead of having to write them over and over again.
SGML is not created in parse tree structures which is formed by data structure, they are created in entity structures, it is formed by entities which can be divided into tructural units named elements. Our result is called “applications”, it means that any mark up language created using this system will be named application.This markup language has several derivatives in which we can find HTML or XML which will be talked about later on.
HTML:
HTML or Hyper Text Mark up Language, was starting to be created in 1980 by Tim Berners-Lee, but it wasn´t until the end of 1990 that the project was totally formulated finishing the software.Afterwards several publications have followed the project explaining the characteristics of it among other things. In 1991 Tim Berners Lee worte an article named HTML tags that explained 20 elements that were part of HTML and how it derivated from SGML, except the hyperlink tags.
HTML is totally formed by elements. It is written using tags in between angle brackets(><) that contain the information we want to write. Those tags give us the information of the way that texts is writen, either in bold, including an image, a quote,… we have the initial tag with attributes that specify what we want, the text we wrote and the ending tag with the same attributes as the begining tag. All these information together creates one element.
In this case while we write this blog we are using HTML language, sometimes we don´t realize about it, whenever we introduce a link, a quote, a title,…We know how to identify them because they are different and that´s what HTML does, gove the web page the information it needs to create what we are asking it to do.
REFERENCES:
RDF, Wikipedia the Free Enciclopedya. Retrieved July 2nd, 2010 from http://es.wikipedia.org/wiki/Resource_Description_Framework
¿Que es RDF?,Malditainternet. Retrieved July, 2010 from http://www.malditainternet.com/node/96
SGML Wikipedia the free Encyclopedia. Retrieved July, 2010 from http://es.wikipedia.org/wiki/SGML
SGML alegsa.com.ar Retrieved July, 2010 from http://www.alegsa.com.ar/Dic/sgml.php
What is HTML? Retrieved November, 2010 from http://www.wisegeek.com/what-is-html.htm
What are HTML tags? Retrieved November, 2010 from http://www.hypergurl.com/whatishtml.html
