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OASIS (Organization for the Advancement of Structured Information Standards) 2nd
ObjectBeingDeserialized property
    XmlAttributeEventArgs class
    XmlElementEventArgs class
    XmlNodeEventArgs class
objects-by-reference
ODBC database 2nd
Open( ) method
    File class
    IDbConnection interface
OpenRead( ) method (File/FileInfo)
OpenText( ) method (File)
operators, relational
opId attribute
    xd:add
    xd:change
    xd:remove
options attribute
    xd:diffgram
    xd:xmldiff
OPTIONS method (HTTP)
Options property (XmlDiff)
or relational operator
Oracle database 2nd 3rd
Organization for the Advancement of Structured Information Standards (OASIS) 2nd
OwnerElement property (XmlAttribute)