A method for excluding structures from a markup document can include identifying a section within a first markup document into which at least a portion of a second markup document is to be inserted. An exception markup document can be identified that specifies structures restricted within the section. The first markup document, the second markup document, and the exception markup document can be based upon the same markup language. The portion of the second markup document can be searched for at least one excluded structure specified within the exception markup document. If no excluded structure is found the portion can be inserted into the section. If at least one of the excluded structures is found, at least one exception handling operation can be performed.