What is the use of XML data collections

Dear all,
I have open the Adventure works database sample and have few technical design question about it :
1- I have seen that seen that some function has been define. IN which case we should use function vs Store procedure ? so far I always have used SP.
2- I have notice also that in some table, there is a field which contains XML content and this XML content is coming from the XML Schema collections. Some shemas has been define here for different tables.
    - What are those shema used for in here ?
    - How they are created ?
    - how they get inserted to Table colum ?
I am not a DBA and knows some basics but not all so thanks for simple explaination :-)
regards

Hi wakefun,
About your questions, I recommend you review the following articles for understanding user function , Store procedure and XML Schema collections in Adventureworks database.
1. Stored Procedures in AdventureWorks;
2.
User-Defined Functions in AdventureWorks;
3. XML Schema Collections (SQL Server).
The XML schema collection is a metadata entity like a table in the database. You can create, modify, and drop them.
the XML stored in a column or variable that a schema is associated with is referred to as typed XML, because the schema provides the necessary data type information for the instance data.
Regards,
Sofiya Li
Sofiya Li
TechNet Community Support

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