The document discusses using semantic technologies like XML, RDF, and OWL to represent data on the web in a structured format that is accessible to machines. It describes two main approaches for accessing semantic data on the deep web: ontology plug-in search and deep web service annotation. Both approaches require a semantic web crawler or bot to harvest concepts from deep web forms and iteratively link them to build enriched ontologies that define domain terms and relationships to provide machine-interpretable meaning.