13. A proofing tool for a computer-aided design (CAD) object having at least one drawing note, the tool stored in a memory of a computer system having a processor, the memory storing the CAD object, the tool comprising: an extractor to extract the drawing note from the CAD object; a rule module to obtain a plurality of rules from the memory, the plurality of rules relating to acceptable drawing notes for the CAD object, the plurality of rules including a first rule having a first plurality of keywords and a second rule having a second plurality of keywords; a comparator to compare the extracted note with the first rule and with the second rule; and a tagging module to generate a result based on the comparisons.
14. The tool of claim 13 , wherein the tagging module is further operable to tag the extracted note when the extracted note satisfies at least one of the first rule and the second rule.