If you're trying to make a PDF accessible, you have to understand tags. To be brief, tags are the objects that tell assistive technology how to present your information to people who cannot see it. Each tag identifies the type of content and what information is stored inside. There are hierarchical tags that build structure and their are content tags that hold... content. Tags are also the key to navigation in a PDF and provide a blueprint for people who cannot visually discern what's in the document. The following is a short list of the various types of… Read the complete article "PDF Tags that Make Documents Accessible."