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.TH Tagset 3 "2000-10-20" "perl v5.8.0" "User Contributed Perl Documentation"
HTML::Tagset \- data tables useful in parsing HTML
\& # Then use any of the items in the HTML::Tagset package
This module contains several data tables useful in various kinds of
\&\s-1HTML\s0 parsing operations.
Note that all tag names used are lowercase.
In the following documentation, a \*(L"hashset\*(R" is a hash being used as a
set \*(-- the hash conveys that its keys are there, and the actual values
associated with the keys are not significant. (But what values are
.ie n .IP "hashset %HTML::Tagset::emptyElement" 4
.el .IP "hashset \f(CW%HTML::Tagset::emptyElement\fR" 4
.IX Item "hashset %HTML::Tagset::emptyElement"
This hashset has as values the tag-names (GIs) of elements that cannot
have content. (For example, \*(L"base\*(R", \*(L"br\*(R", \*(L"hr\*(R".) So
\&\f(CW$HTML::Tagset::emptyElement{'hr'}\fR exists and is true.
\&\f(CW$HTML::Tagset::emptyElement{'dl'}\fR does not exist, and so is not true.
.ie n .IP "hashset %HTML::Tagset::optionalEndTag" 4
.el .IP "hashset \f(CW%HTML::Tagset::optionalEndTag\fR" 4
.IX Item "hashset %HTML::Tagset::optionalEndTag"
This hashset lists tag-names for elements that can have content, but whose
end-tags are generally, \*(L"safely\*(R", omissible. Example:
\&\f(CW$HTML::Tagset::emptyElement{'li'}\fR exists and is true.
.ie n .IP "hash %HTML::Tagset::linkElements" 4
.el .IP "hash \f(CW%HTML::Tagset::linkElements\fR" 4
.IX Item "hash %HTML::Tagset::linkElements"
Values in this hash are tagnames for elements that might contain
links, and the value for each is a reference to an array of the names
of attributes whose values can be links.
.ie n .IP "hash %HTML::Tagset::boolean_attr" 4
.el .IP "hash \f(CW%HTML::Tagset::boolean_attr\fR" 4
.IX Item "hash %HTML::Tagset::boolean_attr"
This hash (not hashset) lists what attributes of what elements can be
printed without showing the value (for example, the \*(L"noshade\*(R" attribute
of \*(L"hr\*(R" elements). For elements with only one such attribute, its value
is simply that attribute name. For elements with many such attributes,
the value is a reference to a hashset containing all such attributes.
.ie n .IP "hashset %HTML::Tagset::isPhraseMarkup" 4
.el .IP "hashset \f(CW%HTML::Tagset::isPhraseMarkup\fR" 4
.IX Item "hashset %HTML::Tagset::isPhraseMarkup"
This hashset contains all phrasal-level elements.
.ie n .IP "hashset %HTML::Tagset::is_Possible_Strict_P_Content" 4
.el .IP "hashset \f(CW%HTML::Tagset::is_Possible_Strict_P_Content\fR" 4
.IX Item "hashset %HTML::Tagset::is_Possible_Strict_P_Content"
This hashset contains all phrasal-level elements that be content of a
P element, for a strict model of \s-1HTML\s0.
.ie n .IP "hashset %HTML::Tagset::isHeadElement" 4
.el .IP "hashset \f(CW%HTML::Tagset::isHeadElement\fR" 4
.IX Item "hashset %HTML::Tagset::isHeadElement"
This hashset contains all elements that elements that should be
present only in the 'head' element of an \s-1HTML\s0 document.
.ie n .IP "hashset %HTML::Tagset::isList" 4
.el .IP "hashset \f(CW%HTML::Tagset::isList\fR" 4
.IX Item "hashset %HTML::Tagset::isList"
This hashset contains all elements that can contain \*(L"li\*(R" elements.
.ie n .IP "hashset %HTML::Tagset::isTableElement" 4
.el .IP "hashset \f(CW%HTML::Tagset::isTableElement\fR" 4
.IX Item "hashset %HTML::Tagset::isTableElement"
This hashset contains all elements that are to be found only in/under
a \*(L"table\*(R" element.
.ie n .IP "hashset %HTML::Tagset::isFormElement" 4
.el .IP "hashset \f(CW%HTML::Tagset::isFormElement\fR" 4
.IX Item "hashset %HTML::Tagset::isFormElement"
This hashset contains all elements that are to be found only in/under
a \*(L"form\*(R" element.
.ie n .IP "hashset %HTML::Tagset::isBodyMarkup" 4
.el .IP "hashset \f(CW%HTML::Tagset::isBodyMarkup\fR" 4
.IX Item "hashset %HTML::Tagset::isBodyMarkup"
This hashset contains all elements that are to be found only in/under
the \*(L"body\*(R" element of an \s-1HTML\s0 document.
.ie n .IP "hashset %HTML::Tagset::isHeadOrBodyElement" 4
.el .IP "hashset \f(CW%HTML::Tagset::isHeadOrBodyElement\fR" 4
.IX Item "hashset %HTML::Tagset::isHeadOrBodyElement"
This hashset includes all elements that I notice can fall either in
.ie n .IP "hashset %HTML::Tagset::isKnown" 4
.el .IP "hashset \f(CW%HTML::Tagset::isKnown\fR" 4
.IX Item "hashset %HTML::Tagset::isKnown"
This hashset lists all known \s-1HTML\s0 elements.
.ie n .IP "hashset %HTML::Tagset::canTighten" 4
.el .IP "hashset \f(CW%HTML::Tagset::canTighten\fR" 4
.IX Item "hashset %HTML::Tagset::canTighten"
This hashset lists elements that might have ignorable whitespace as
.ie n .IP "array @HTML::Tagset::p_closure_barriers" 4
.el .IP "array \f(CW@HTML::Tagset::p_closure_barriers\fR" 4
.IX Item "array @HTML::Tagset::p_closure_barriers"
This array has a meaning that I have only seen a need for in
\&\f(CW\*(C`HTML::TreeBuilder\*(C'\fR, but I include it here on the off chance that someone
When we see a "<p>" token, we go lookup up the lineage for a p
element we might have to minimize. At first sight, we might say that
if there's a p anywhere in the lineage of this new p, it should be
closed. But that's wrong. Consider this document:
The second p is quite legally inside a much higher p.
My formalization of the reason why this is legal, but this:
isn't, is that something about the table constitutes a \*(L"barrier\*(R" to
the application of the rule about what p must minimize.
So \f(CW@HTML::Tagset::p_closure_barriers\fR is the list of all such
.ie n .IP "hashset %isCDATA_Parent" 4
.el .IP "hashset \f(CW%isCDATA_Parent\fR" 4
.IX Item "hashset %isCDATA_Parent"
This hashset includes all elements whose content is \s-1CDATA\s0.
You may find it useful to alter the behavior of modules (like
\&\f(CW\*(C`HTML::Element\*(C'\fR or \f(CW\*(C`HTML::TreeBuilder\*(C'\fR) that use \f(CW\*(C`HTML::Tagset\*(C'\fR's
data tables by altering the data tables themselves. You are welcome
to try, but be careful; and be aware that different modules may or may
react differently to the data tables being changed.
Note that it may be inappropriate to use these tables for \fIproducing\fR
\&\s-1HTML\s0 \*(-- for example, \f(CW%isHeadOrBodyElement\fR lists the tagnames
for all elements that can appear either in the head or in the body,
such as \*(L"script\*(R". That doesn't mean that I am saying your code that
produces \s-1HTML\s0 should feel free to put script elements in either place!
If you are producing programs that spit out \s-1HTML\s0, you should be
\&\fIintimately\fR familiar with the DTDs for \s-1HTML\s0 or \s-1XHTML\s0 (available at
\&\f(CW\*(C`http://www.w3.org/\*(C'\fR), and you should slavishly obey them, not
the data tables in this document.
HTML::Element, HTML::TreeBuilder, HTML::LinkExtor
Copyright 1995\-2000 Gisle Aas; copyright 2000 Sean M. Burke.
This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
Current maintainer: Sean M. Burke, <sburke@cpan.org>
Most of the code/data in this module was adapted from code written by
Gisle Aas <gisle@aas.no> for \f(CW\*(C`HTML::Element\*(C'\fR,
\&\f(CW\*(C`HTML::TreeBuilder\*(C'\fR, and \f(CW\*(C`HTML::LinkExtor\*(C'\fR.
projects / OpenSPARC-T2-DV / blob