HTML and CSS Reference
In-Depth Information
•
The content may be a set of grammar rules that defines the order
and nesting of tags within the defined element. You use this con-
tent type when the tag being defined contains only other tags,
without conventional content allowed directly within the tag. In
HTML, the
<ul>
tag is such a tag, as it can contain only
<li>
tags.
•
Mixed content, denoted by a comma-separated list of element
names and the keyword
#PCDATA
, is enclosed in parentheses. This
content type allows tags to have user-defined content, along with
other markup elements. The
<li>
tag, for example, may contain
user-defined content as well as other tags.
The last two content types form the meat of most DTD element declar-
ations. This is where the fun begins.
