XML Domain Index Order Key Node Matching

The patent merges XPath-based indexing with domain-specific indexing by integrating domain functions directly into the XPath query evaluation process. The database management system executes domain functions during the index scan phase rather than as separate post-processing steps, allowing unified query processing that simultaneously leverages both indexing approaches while producing integrated results at the node level.

The patent segments the domain-specific index results to the node level by maintaining awareness of XML document hierarchy. Instead of treating entire XML documents as atomic units, the system identifies and returns specific nodes that satisfy domain predicates, thereby achieving both efficient domain operations and precise node-level results through hierarchical segmentation of the document structure.

The patent makes the XPath query evaluation mechanism universal by enabling it to execute domain-specific functions directly. The same query processing infrastructure that handles standard XPath operations is extended to invoke domain functions, allowing a single unified mechanism to serve both traditional XPath querying and domain-specific operations without sacrificing node-level precision or domain semantics utilization.

The patent applies local quality by treating different nodes differently based on their hierarchical position and content characteristics. Rather than uniformly treating all nodes as identical documents, the system adapts its behavior to specific node contexts, applying domain predicates appropriately to each node type and position, thereby maintaining operational simplicity while achieving accurate hit results that respect XML structural semantics.