Demographics Library Data files contain four kinds of information: file attributes, field attributes, field values, and field value attributes.
File attributes are information about the Demographics Library Data file. This includes an overview of the data available, the number of fields contained in the .DLD file, and information about the key field. This information can be accessed with the functions DlFileGetAttribute and DlFileNumFields.
Field attributes include information about each field within the .DLD file, such as field name and description, field size, and data types. This information can be accessed with the function DlFieldGetAttribute.
Field values are the actual data contained in a field, such as the congressional district for a specific ZIP Code. This information can be accessed with the functions DlFieldGetNum and DlFieldGetString.
Field value attributes are information about specific data values within a field, such as a description of a piece of data. This information can be accessed with the functions DlFieldGetValueAttribute and DlFieldGetString.
Information Available via Demographics Library
Two different Demographics Library Data sets are available for license from Precisely:
- Standard 2000 and 2010 Census Demographics
A complete listing of data available in these DLD files can be found in Data Files.