Document assembly system

A non-transitory computer-readable storage medium having executable instructions stored thereon that, when executed by at least one processor of a computer system, cause the at least one processor to perform a set of operations, comprising:

• associating document assembly instructions with selected locations within at least one initial XML document to generate at least one XML source document, the document assembly instructions being instructions to be executed by at least one processor of a computer system to determine content at corresponding locations of at least one instance document to be generated from said at least one initial XML document;
• wherein:
• (i) said at least one initial XML document is valid with respect to a predetermined DTD or schema that does not include said document assembly instructions;
• (ii) the at least one XML source document is valid with respect to the same predetermined DTD or schema as said at least one initial XML document;
• (iii) the associating of at least one of said document assembly instructions with one or more of said locations within said at least one initial XML document associates said at least one document assembly instruction with one or more selected portions of said at least one XML source document;
• and
• (iv) one or more of the document assembly instructions associated with selected portions of said at least one XML source document define one or more conditions that determine whether the one or more corresponding selected portions of said at least one XML source document will be included in said at least one instance document;
• and
• storing the at least one XML source document on at least one of said non-transitory computer-readable storage medium and a second non-transitory computer-readable storage medium.