HTML Section Searching

HTML has internal structure in the form of tagged text which you can use for section searching. For example, you can define a section called headings for the <H1> tag. This allows you to search for terms only within these tags across your document set.

To query, you use the WITHIN operator. Oracle returns all documents that contain your query term within the headings section. Thus, if you wanted to find all documents that contain the word oracle within headings, you issue the following query:

'oracle within headings'

Creating HTML Sections

The following code defines a section group called htmgroup of type HTML_SECTION_GROUP. It then creates a zone section in htmgroup called headline identified by the <H1> tag:

begin
ctx_ddl.create_section_group('htmgroup', 'HTML_SECTION_GROUP');
ctx_ddl.add_zone_section('htmgroup', 'heading', 'H1');
end;

You can then index your documents as follows:

create index myindex on docs(htmlfile) indextype is ctxsys.context 
parameters('filter ctxsys.null_filter section group htmgroup');

After indexing with section group htmgroup, you can query within the heading section by issuing a query as follows:

'Oracle WITHIN heading'

Searching HTML Meta Tags

With HTML documents you can also create sections for NAME/CONTENT pairs in <META> tags. When you do so you can limit your searches to text within CONTENT.

Example: Creating Sections for <META>Tags

Consider an HTML document that has a META tag as follows:

<META NAME="author" CONTENT="ken">

To create a zone section that indexes all CONTENT attributes for the META tag whose NAME value is author:

begin
ctx_ddl.create_section_group('htmgroup', 'HTML_SECTION_GROUP');
ctx_ddl.add_zone_section('htmgroup', 'author', 'meta@author');
end

After indexing with section group htmgroup, you can query the document as follows:

'ken WITHIN author'