How to solve IF sections like Web search

[toplisek]

I like to solve web search like article (IBM):
Clustering Hypertext with applications to Web searching
[almaden.ibm.com...]

There are sections inside web documents which needs intelligent IF sentence. If some document is searched it should find several sections based on parameters (like time) and define time of the end period. Each sections will define time to be executed.

Which way is the best to find end period based on web content (sections)?

[eelixduppy]

I understand very little of what you are asking for, can you please elaborate a bit and perhaps provide some examples?

[toplisek]

You see I have many law statements. I like to set calculation when somebody likes to see time period when some law will be executed.

As we have many statements and each statement will define time I need to calculate such time period. I guess there should be some Id for each statement and each statement should have time period. Issue is if you have many statements that depend on each other (cross checking).