How does Virtuoso generate XML from relational data?

Virtuoso has several mechanisms for transforming SQL data into XML. One option is the "FOR XML" clause, which is a SQL option that can convert the output of a SELECT statement into a tree. €¢ SQLX is the standard SQL way of creating XML content from relational data.

Special aggregates and functions allow composing trees in queries • Mapping Schemas - A mapping schema is an XML schema, which defines how the data is to be extracted from, joins of relational tables. When an XPATH query is evaluated against a mapping schema, Virtuoso generates an SQL query, which will retrieve only the required rows and then generate the XML tree. More.

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