Check UDT,UDF and UDO

hello,
  Does SAP provides sample code or guide line about how to check the existence of the UDO,UDF and UDO before executing the Add On??
Regards,
Kit

Use DI API metadata objects to check this existence. This
is clearly described in the e-learning.
The objects are UserTablesMD, UserFieldsMD, UserObjectsMD.

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    ==
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    == today
    ==
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    ==
    Application Basics
    Name
    Firefox
    Version
    3.6.3
    Profile Directory
    Open Containing Folder
    Installed Plugins
    about:plugins
    Build Configuration
    about:buildconfig
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    Name
    Version
    Enabled
    ID
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    2.1.0.5
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    AVG Safe Search
    9.0.0.783
    true
    {3f963a5b-e555-4543-90e2-c3908898db71}
    Java Console
    6.0.17
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    Microsoft .NET Framework Assistant
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    Name
    Value
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    browser.places.smartBookmarksVersion
    2
    browser.startup.homepage_override.mstone
    rv:1.9.2.3
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    0
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    0
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    0
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    0
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    true
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    print.printer_HP_Photosmart_D5300_series.print_footerright
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    print.printer_HP_Photosmart_D5300_series.print_headerright
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    true
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    0.5
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    0.5
    print.printer_HP_Photosmart_D5300_series.print_margin_right
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    0.5
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    0
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    500
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    9
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    11.00
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    0
    print.printer_HP_Photosmart_D5300_series.print_paper_size_unit
    1
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    8.50
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    1.00
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    true
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    false
    print.printer_HP_Photosmart_D5300_series.print_unwriteable_margin_bottom
    0
    print.printer_HP_Photosmart_D5300_series.print_unwriteable_margin_left
    0
    print.printer_HP_Photosmart_D5300_series.print_unwriteable_margin_right
    0
    print.printer_HP_Photosmart_D5300_series.print_unwriteable_margin_top
    0
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    true
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    false
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    ==
    3.6.3
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    ==
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    ==
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    http://kb.mozillazine.org/Unable_to_install_themes_or_extensions_-_Firefox#Unexpected_installation_error_-203
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