6.1.1 Tag Objects
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Raises a TemplateError exception using the string in the
msg argument.
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Returns TRUEif the attribute specified in the name
argument was defined for the tag.  All attribute names are converted
to lower case by the template parser.
- 
- 
If the attribute specified in the name argument is not defined
for the tag a TemplateError exception will be raised.
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- 
Retrieves the value of the attribute specified in the name
argument.
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- 
Sets the value of the attribute named in the name argument to
the value in the value argument.
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Defines the order that the tag attributes will be written during
conversion to HTML.  The template parser captures the attribute
sequence from the template file then calls this method.
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Returns a list of attribute name, value tuples which are defined for
the tag.
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- 
Sends all tag attributes to the write_content() method of the
execution context in the ctx argument.  Any attributes named in
additional arguments will not be written.