A document analysis tool provides a 3-dimensional network representation of temporal evolution of text in a document. The antenna member is configured to be capacitively coupled to body tissue in which the housing is implanted. The replaceable wear elements may be used to retrofit existing filter plates. The present invention also provides a method of forming a composite structure which includes buried conductiveSON structures as well as a method of forming a composite structure including only buried void planes. The system generates the validation matrix from the captured metrics and uses the validation matrix to evaluate performance.