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includeonce Tag

Format: <includeonce>

Purpose: Marks an include file to be included only once. Without includeonce it often happens that library files are included several times, simply because the library is used by several other libraries or program parts.

If the include file contains includeonce it is included once and subsequent (static) include statements for the same file are ignored. The includeonce tag makes sense only within an include file.

Note: The includeonce Tag is Case Sensitive, which means heitml will not recognize it if you use capital letters (e.g. <INCLUDEONCE >).
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