  Web is a wide term which mainly consists of surface web and hidden web. One
can easily access the surface web using traditional web crawlers, but they are
not able to crawl the hidden portion of the web. These traditional crawlers
retrieve contents from web pages, which are linked by hyperlinks ignoring the
information hidden behind form pages, which cannot be extracted using simple
hyperlink structure. Thus, they ignore large amount of data hidden behind
search forms. This paper emphasizes on the extraction of hidden data behind
html search forms. The proposed technique makes use of semantic mapping to fill
the html search form using domain specific database. Using semantics to fill
various fields of a form leads to more accurate and qualitative data
extraction.
