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<concept xml:lang="en" id="GUID-86E704A2-FB15-5D78-BFD2-0E7117360342"><title>Fields</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>Fields allow calculated text, such as a page number, file name, or time and date, to be inserted into a text object and updated when required. Fields are designed to go into printer headers. As far as the content of a text object is concerned, fields are just a sequence of characters. The field data is maintained as a separate part of a plain text object’s data. The <xref href="GUID-2279727F-55BD-3D88-9E56-96B102F74E5C.dita"><apiname>CTextField</apiname></xref> class provides the base for fields.</p> <p>The field system is extensible: the <xref href="GUID-6202B0B7-663C-3172-BE13-88D77081B42C.dita"><apiname>MTextFieldFactory</apiname></xref> field factory allows new field types to be added to those already provided.</p> </conbody></concept>