cdx

CDX is an acronym that can refer to several unrelated topics across technology and biology.

In computing, CDX commonly denotes a compound index file used by database systems that store .dbf data files. The .cdx file contains multiple index expressions and is used to accelerate queries on the associated table. CDX formats have historically been used with dBASE III/IV, Clipper, FoxPro, and related DBF-based applications; they are usually created alongside the data file and managed by database tools.

In web archiving, CDX refers to a text-based index format used by web archives such as the Internet Archive's Wayback Machine to record captured web pages. Each line encodes fields such as timestamp, original URL, status code, MIME type, and the length of the capture, enabling efficient searching and retrieval of archived mementos.

In molecular biology, CDX denotes the caudal-type homeobox gene family, which encodes transcription factors involved in development and intestinal differentiation. Members include CDX1, CDX2, and CDX4; CDX2, in particular, is a marker of intestinal lineage and is studied in developmental biology and oncology.