The start-tag is required for this element. The end-tag is optional, if your SGML declaration allows minimization.
Formatted as a displayed block.
In real life, ToCs are usually generated automatically by the presentation system and never have to be represented explicitly in the document source.
Label specifies an identifying string for presentation purposes.
Generally, an explicit Label attribute is used only if the processing system is incapable of generating the label automatically. If present, the Label is normative; it will used even if the processing system is capable of automatic labelling.
For examples, see ToC.
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