10. A method for exchanging XML data, comprising acts of: providing, by a data aggregator, a predetermined XML provider file structure to each of a plurality of content providers having proprietary content schemas, wherein the predetermined XML provider file structure has an XML schema that defines a structure of content provider files used to access content from the content providers according to the predetermined XML provider file structure; referencing content provider files of the content providers, wherein the content provider files of the content providers represent content of the content providers according to the predetermined XML provider file structure; and retrieving, from memory, content provider files of the content providers and importing content contained therein into the relational database system.
17. The method as recited in claim 10 , wherein said phrase file includes definitions of legal combinations of content.