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Revision 7 (Michel Condemine Admin, 02/22/2023 09:49 PM) → Revision 8/17 (Michel Condemine Admin, 02/22/2023 10:00 PM) 

# OpenOpcUaWiki 
 ## OPC Foundation LDS 

 * The Local Discovery Server (LDS) provides the necessary infrastructure to publicly expose the OPC UA Servers available on a given computer. 
 * When OpenOpcUaCoreServer is configured to register to the LDS you have to copy its certificate in C:\ProgramData\OPC Foundation\UA\Discovery\pki\trusted\certs when using the OPC Fondation LDS. 

 ## What is ETL? 

 * ETL, which stands for extract, transform and load, is a data integration process that combines data from multiple data sources into a single, consistent data store that is loaded into a data warehouse or other target system. 
 * OOUACoreServer is the perfect software to achieve ETL. 

 #. ASCII_TABLE 
 ![ASCII Table](http://www.openopcua.org/redmine/attachments/download/3845/ASII_TABLE.jpg) !ASII_TABLE.jpg! 

 h1. LUA Tutorial Link 
 * [[https://www.tutorialspoint.com/lua/if_else_statement_in_lua.htm]]