The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 2011
Filed:
Sep. 28, 2006
Abhyudaya Agrawal, San Francisco, CA (US);
Thomas Baby, Foster City, CA (US);
Nipun Agarwal, Santa Clara, CA (US);
Sam Idicula, San Jose, CA (US);
Ravi Murthy, Fremont, CA (US);
Eric Sedlar, Redwood City, CA (US);
Abhyudaya Agrawal, San Francisco, CA (US);
Thomas Baby, Foster City, CA (US);
Nipun Agarwal, Santa Clara, CA (US);
Sam Idicula, San Jose, CA (US);
Ravi Murthy, Fremont, CA (US);
Eric Sedlar, Redwood City, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
In-place XML schema evolution occurs by evaluating an existing XML schema in a database system to see if it is compatible with a new XML schema. To determine if the old schema is compatible with the new schema, a lock-step traversal is performed on the two schemas. Each instruction in the old schema is compared to instructions in the new schema. Detected differences between the two schemas are evaluated to determine if existing XML documents are still compatible with the new schema. If they are, then an in-place schema evolution operation can take place. The in-place schema operation basically, involves appending the updated object information to the underlying object type and preserving the order of elements in a document by storing element mapping information on disk.