# Definition of Terms

The following are specialized terms used throughout the guide.

anchor | XML markup that defines both anchors and hyperlinks. An anchor is a named place in a document to which other documents can form a link. Anchors use the XML anchor tags (`<a xmlns:xlink= xlink href=> </a>`) to facilitate navigation within a document. The major browsers do not currently support linking in XML documents.
block | All source document content (including subheadings) associated with Heading Level 1. Export identifies and/or generates blocks from the input stream for the implementation of the your XML markup.
block chunk or chunk | All source document content associated with Heading Levels 2 through 6. Chunks are subdivisions of blocks. You can supply specific XML markup for the different levels of block chunks.
callback | A function optionally supplied by your application and called from the Export API. For example, callbacks allow your application to monitor the progress of the conversion process dynamically.
stream | Transmission of a file's content between memory and disk in a continuous flow.
token | The vehicle for conveying specific types of information to and from the API during the conversion process. Tokens are placeholders for markup that appears in the output. See Export Tokens.

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