This sounds very much like constraint programming to me. For the most part, unification is an equality constraint between two variables. If the two are unbound, there's no change, if one is bound, the value is propagated to the other, if both are bound, the values must be equivalent or the network is inconsistent. On an inconsistency, remove the last constraint and try placing it somewhere else. The more complex "conditional unification" you're talking about are procedural constraints; the constraint is satisfied iff the body of the URI matches the HTML.
You may want to look at this
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
Outside of code tags, you may need to use entities for some characters:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||