- o -

• Oblique : te::at
• ONLY_INSIDE : te::vp
• ONLY_OUTSIDE : te::vp
• OPTIONAL : te::xsd
• ORDINAL_TIME_INSTANT : te::dt
• ORDINAL_TIME_PERIOD : te::dt
• OVERLAPS : te::dt , te::gm
• Overlay : te::map
• Overline : te::at