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The searchnodelinks table

The tokens in Figure 3 didn't contain any links. Here's some text that links back to node 2 (the node that talks about ponies and badgers):

<a href="http://example.com/node/2">Talk of badgers and ponies</a>

This is in node 3, and the link references node 2. Now look at the contents of the search_node_links table after node 3 has been indexed:

mysql> select * from search_node_links;

sid 1 type	1	nid 1	caption
3 1 node	1	2 1	talk badgers and ponies

Figure 18: search_node_links has "caption" text that will be added to a node's text at indexing time.

The utility of this text only makes sense if we also look at the search_nodeapi function:

<?php function search_nodcapi(sSnode, Sop, Steaser - NULL, Spagc ■ NULL) { switch (Sop) {

ease 'update index':

Sresult ■ db_query("SELECT caption FROM {scarch_node_links} WHERE nid %d", Snode->nid);

while (Slink - db_fetch_object(Sresult)) { Slinks[] - Slink->caption;

Soutput " '<a>(' . implodo(', Soutput) . ')</a>';

return Soutput;

Figure 19: The search_nodeapi function takes care that the text from referencing links gets added to a node's text at indexing time.

Here you can see that before a node gets indexed, it's text is extended with all of the link text from nodes that reference it. The referring link texts get wrapped in <a> tags to boost the score of the words appropriately.

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