12. The structured document processing method according to claim 10 , comprising: the state-transition-diagram information storing step, for which a predetermined source node in the state transition diagram is set in a source node with an attribute variable which a predetermined attribute is defined as; the matchingness check step of deciding that there is matchingness between the source node and the new node in a selection pair, when the source node in the selection pair is a source node with the attribute variable, and concurrently when the element name and the attribute name of the source node and the new node in the selection pair are the same as those of the new node in the same selection pair; an attribute variable value storing step of storing, as the attribute variable value, an attribute value of the new node in a selection pair which has been decided to have matchingness, when the source node in the selection pair is a source node with the attribute variable; obtaining a result of parsing a node to be used for a new node of the new structured document; and the source-structured-document using step of using, as the result of parsing a node to be used for a new node of the new structured document, a result of the parsing which is obtained by substituting the attribute variable value for the attribute variable in a result of parsing the node to be used for the new node of the new structured document, if the node to be used is a source node with the attribute variable, in a case where a result of parsing the node to be used for the new node of the new structured document, the node being a node of a structured document to be used for the new structured document, is used as a result of parsing the new node of the new structured document.
10. A structured document processing method comprising: a state-transition-diagram information storing step of storing, as state-transition-diagram information, information concerning a state transition diagram in which a plurality of source nodes of each of a plurality of source structured documents transit from one to another in order of occurrence from a head of the source structured document with regard to the plurality of source structured documents, each of which is designed to be able to be partitioned into the plurality of source nodes as a plurality of nodes concerning the respective structured partitions, and storing a state transition, which would occur commonly in some of the plurality of source structured documents, as a single common state transition in the state transition diagram; a selection-pair extracting step of extracting, as a selection pair, a pair consisting of one of a plurality of new nodes of a new structured document and corresponding one of the plurality of source nodes in the state transition diagram, in accordance with order in which the new nodes occur from a head of the new structured document, and in accordance with order in which the source nodes transit from one to another in the state transition diagram, with regard to the new structured document which is designed to be able to be partitioned into the plurality of new nodes as a plurality of nodes concerning the respective structured partitions; a matchingness check step of determining whether or not there is matchingness between the source node and the new node in each of the selection pairs, on basis of descriptions respectively of the source node and the new node; a node qualifying step of qualifying the source node in a selection pair as a node to be used for the new node in the same selection pair when it is decided that there is matchingness between the source node and the new node in the selection pair; a transition-history information generating step of generating, as transition-history information, information concerning a transition history which goes on through a plurality of nodes to be used in the state transition diagram in order of transition; a structured-document-to-be-used selecting step of selecting a single source structured document as a structured document to be used for the new structured document on basis of the transition-history information; and a source-structured-document using step of using, as a result of parsing a new node of the new structured document, a result of parsing a node to be used for the new node in the structured document to be used for the new structured document.