SQL & PL/SQL

Guys,
When I see an existing code in one of our packages, I could see some thing called WSGL in-built package. And the application that uses this is a web application. Is this something like web-related PL/SQL? May I know where I can get some documentation for this? Tried in google. But no use! ;-(

Forgive me if this is not the forum that I should place this.

Below is the sample code.

      WSGL.LayoutRowStart('TOP');
      WSGL.LayoutData(htf.bold('Crf Number:'));
      WSGL.LayoutData(WSGL.BuildQueryControl('CRF_NUMBER', '20', FALSE, p_maxlength=>'15'));
      WSGL.LayoutRowEnd;
      WSGL.LayoutRowStart('TOP');
      WSGL.LayoutData(htf.bold('DevCenter:'));
      InitialiseDomain('CGE_DEVELOPMENT_CENTER');
      WSGL.LayoutData(WSGL.BuildDVControl(D_CGE_DEVELOPMENT_CENTER, WSGL.CTL_QUERY));
      WSGL.LayoutRowEnd;
      WSGL.LayoutRowStart('TOP');
      WSGL.LayoutData(htf.bold('Business Architect:'));
      WSGL.LayoutData(WSGL.BuildQueryControl('BUSINESS_ARCHITECT', '50', FALSE, p_maxlength=>'50'));
      WSGL.LayoutRowEnd;
      WSGL.LayoutRowStart('TOP');
      WSGL.LayoutData(htf.bold('Business Release:'));
      WSGL.LayoutData(WSGL.BuildQueryControl('BUSINESS_RELEASE', '50', FALSE, p_maxlength=>'100'));
      WSGL.LayoutRowEnd;

FYI, I'm using Database 9.2.

Cheers
Sarma.