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extract_html_content function extracts the meaningful textual content from an HTML file, and writes the text into the
DRECONTENT field of the document.
extract_html_content( doc [, Filename])
||(LuaDocument) The document into which the extracted content is written.|
||(string) The filename of the HTML document from which to extract content. If you do not specify a value for this argument, the function uses the file associated with the document.|
true if the operation is successful.