How does Virtuoso store XML?
Virtuoso offers the XMLType datatype. This data type can be made from a text representation and can again be converted into text. XPATH, XSLT, Xquery and SQLX operations can be applied to this type. This type can be stored as either text or in a pre-parsed binary format. XMLType defined as a column value, a XML tree can be specifically full text indexed so that XML elements are taken into account. This indexing allows, besides normal text index operations, also resolving occurrence of elements, inclusion of text inside elements etc. 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 dat
