Abstract: This specification describes technologies relating to fixed width encoding/decoding of document posting lists. In general, one aspect of the subject matter described in this specification can be embodied in apparatuses that include a server obtaining a list of one or more of document identification numbers, each of the document identification numbers uniquely identifying a document; an encoding device operatively connected to the server, the encoding device generating a sequence of deltas from the sequential list of one or more of the document identification numbers, and encoding each delta in the sequence of deltas using a fixed-width encoding scheme.

Abstract: This specification describes technologies relating to fixed width encoding/decoding of document posting lists. In general, one aspect of the subject matter described in this specification can be embodied in apparatuses that include a server obtaining a list of one or more of document identification numbers, each of the document identification numbers uniquely identifying a document; an encoding device operatively connected to the server, the encoding device generating a sequence of deltas from the sequential list of one or more of the document identification numbers, and encoding each delta in the sequence of deltas using a fixed-width encoding scheme.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, that are operable to identify a web page that is to be a basis for an advertisement creative; extract content associated with the web page to create an advertisement for serving in response to a request, extracting including abstracting content extracted so that the advertisement is not specifically descriptive of the web page; create a title for the advertisement; combine a body with the title; and combine with the body a uniform resource locator (URL) for a landing page that is to be associated with the advertisement creative.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, that are operable to identify a web page that is to be a basis for an advertisement creative; extract content to create an advertisement for serving in response to a request, extracting including extracting a title for the web page; create a title for the advertisement creative including computing a snippet of the title based on the request and the extracted title; combine a body with the advertising creative title; and combine with the body a uniform resource locator (URL) for a landing page that is to be associated with the advertisement creative.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, that are operable to index a plurality of commercial landing web pages in a database using queries previously resolved to the commercial landing pages where each entry in the database includes at least one query and a pointer to a commercial landing web page. A query can be received. The query can be processed by one or more processors including identifying a relevant commercial landing web page using the query. An advertisement creative can be generated from the relevant commercial landing web page.