1. A system comprising: a memory comprising an integrated data set comprising a combination of relational-model data type definitions, object-oriented data definitions, and XML definitions, wherein the integrated data set includes: data provided by a plurality of sources including a first source and a second source, rules to decompose the data provided by the plurality of sources into data attributes, and rules to compose documents from the data attributes decomposed from the data provided by the plurality of sources; and a processor configured to: receive, from the first source, first data included in the integrated data set; receive, from the second source, second data included in the integrated data set; and generate at least one document in at least one XML format or an XML-like format using the a rule for composing the at least one document included in the integrated data set, wherein the at least one document includes a portion of the first data and a portion of the second data identified by the integrated data set, and wherein the first source and the second source, respectively, comprise at least one of: (i) an XML document, (ii) a relational database, or (iii) an object oriented input.