EANC is an electronic collection of Eastern Armenian texts supplemented with basic metatext (bibliographic) information and processed by parsing software which generates lexical and morphological markup data. EANC markup is a system of internal tags that are assigned to texts and word tokens in order to enhance the search functionality.

Three major layers of markup are implemented in EANC:

Most of the token markup tags are directly accessible to the EANC user. These tags are displayed when the user places the mouse over a token in the list of query results or left-clicks a token inside a Library text. Bibliographic tags are primarily accessible through the EANC interface (e.g. Specify Subcorpus), but are also displayed along with query matches. A few tags, including auxiliary markup, are used for internal purposes only.