Structured document management system and structured document management method

A structured document management system for managing a structured document, comprising:

• an element registration unit that registers attribute information and content information about each of elements in the structured document as element information;
• a decomposition unit that decomposes an inputted structured document into plural partial structures in accordance with a setting and generates a hierarchical relationship between the partial structures as first structural information
• a structural information registration unit that:
• determines a hierarchical relationship between the elements in the partial structure as second structural information;
• assigns each of the elements in the partial structure a depth first node order;
• and
• associates a maximum node order of node orders of elements with each element in the partial structure
• registers the first and second structural information as binary format structural information;
• and
• an information retaining unit that retains the element information registered by the element registration unit as a record of a relational database while preserving the binary format structural information registered by the structural information registration unit.