graphic_file_attr_name
graphic_file_attr_name(tagname[, doc])
This function returns the name of the graphic file name attribute for the graphic tag specified by tagname. If there is no file name attribute defined for tagname, graphic_file_attr_name returns the null string. The doc argument specifies the identifier of the document tree to query. If doc is omitted or 0, the current document is used.
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If the document type definition for your document instance includes the NAMECASE GENERAL NO setting, then the tagname parameter will be case-sensitive.
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The function graphic_attr_name(tagname, "filename") function returns the same value as the graphic_file_attr_name(tagname) function.
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