11.2 HTML Section Searching with Oracle Text

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

To query, you use the WITHIN operator. Oracle Text returns all documents that contain your query term within the headings section. For example, if you want to find all documents that contain the word oracle within headings, enter the following query: 

'oracle within headings'

This section contains these topics:

11.2.1 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 heading 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 the htmgroup section group, you can query within the heading section by issuing this query: 

'Oracle WITHIN heading'

11.2.2 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.

Consider an HTML document that has the following META tag: 

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

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 the htmgroup section group, you can query the document: 

'ken WITHIN author'