public boolean shouldProcessTag(String name)
Before attempting to parse a tag, the tokenizer will ask the handler whether the tag should be processed - avoiding
additional tag parsing makes the tokenizer quicker.

If true is returned, the tokenizer will fully parse the tag and pass it into the #tag(com.opensymphony.module.sitemesh.html.Tag)  method.
If false is returned, the tokenizer will not try to parse the tag and pass it to the ##text(com.opensymphony.module.sitemesh.html.Text)  method,
untouched.

 public  void tag(Tag tag)
Called when tokenizer encounters an HTML tag (open, close or empty).

The Tag instance passed in should not be kept beyond the scope of this method as the tokenizer will attempt
to reuse it.

 public  void text(Text text)
Called when tokenizer encounters anything other than a well-formed HTML tag.

The Text object is used instead of a String to allow the String to be lazy-loaded.

The Text instance passed in should not be kept beyond the scope of this method as the tokenizer will attempt
to reuse it.

 public  void warning(String message,
    int line,
    int column)
Called when tokenizer encounters something it cannot correctly parse. Typically the parsing will continue and the
unparseable will be treated as a plain text block, however this callback provides indication of this.