Batch Metadata Modifier Tool
The Batch Metadata Modifier Tool allows knowledgeable metadata professionals to modify individual or multiple XML files simultaneously.
The tool has find / replace capabilities, can delete metadata elements, and can import metadata elements from external files.
It can be run as an ArcGIS Add-In or as a stand-alone Windows executable. Thumbnails can also be generated for a batch of selected geodatabase objects within ArcCatalog.