Guideline 2

Create semantically-rich languages.

• separation of content/structure from presentation
• define element types that allow classification and grouping.
• define element types that identify important text content.

Example:

 
 <HOUSE-FOR-SALE>
    <DESC>
       A cheap ranch in the middle of nowhere, lots of land
    </DESC>
    <PRICE value=600000 currency=dollar>
    <DATE-ENTERED value=...>
    <LOCATION>
       <TOWN> ...
       <STREET> ...
    </LOCATION>
    <PICTURE href=...>
      A one story ranch, yellow walls, one door, one window
    </PICTURE>
 </HOUSE-FOR-SALE>