By David Moisan. Copied from his Web: http://www.davidmoisan.org/摘自网络 http://www.davidmoisan.org/
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<!DOCTYPE CATALOG [ <!ENTITY AUTHOR "John Doe"><!ENTITY COMPANY "JD Power Tools, Inc."><!ENTITY EMAIL "jd@jd-tools.com"><!ELEMENT CATALOG (PRODUCT+)><!ELEMENT PRODUCT(SPECIFICATIONS+,OPTIONS?,PRICE+,NOTES?)><!ATTLIST PRODUCTNAME CDATA #IMPLIEDCATEGORY (HandTool|Table|Shop-Professional) "HandTool"PARTNUM CDATA #IMPLIEDPLANT (Pittsburgh|Milwaukee|Chicago) "Chicago"INVENTORY (InStock|Backordered|Discontinued) "InStock"><!ELEMENT SPECIFICATIONS (#PCDATA)><!ATTLIST SPECIFICATIONSWEIGHT CDATA #IMPLIEDPOWER CDATA #IMPLIED><!ELEMENT OPTIONS (#PCDATA)><!ATTLIST OPTIONSFINISH (Metal|Polished|Matte) "Matte" ADAPTER (Included|Optional|NotApplicable) "Included"CASE (HardShell|Soft|NotApplicable) "HardShell"><!ELEMENT PRICE (#PCDATA)><!ATTLIST PRICEMSRP CDATA #IMPLIEDWHOLESALE CDATA #IMPLIEDSTREET CDATA #IMPLIEDSHIPPING CDATA #IMPLIED><!ELEMENT NOTES (#PCDATA)>]>