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Revision 10 (Michel Condemine Admin, 02/22/2023 10:09 PM) → Revision 11/17 (Michel Condemine Admin, 02/22/2023 10:23 PM) 

# OpenOpcUa Wiki 
 ## 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/3846/ASCII_TABLE_Small.png) 

 ## LUA Tutorial Link 
 [Overview](https://www.tutorialspoint.com/lua/lua_overview.htm) 
 [if_else](https://www.tutorialspoint.com/lua/if_else_statement_in_lua.htm)