n the respective object's field <code>thing</code>.</li> </ul> <h2 id="extending_clip">Extending Clip</h2> <p>You can define new tag and attribute processors with the macros <code><a href="#MACRO-FUNCTION%20CLIP%3ADEFINE-TAG-PROCESSOR" class="xref">DEFINE-TAG-PROCESSOR</a></code> and <code><a href="#MACRO-FUNCTION%20CLIP%3ADEFINE-ATTRIBUTE-PROCESSOR" class="xref">DEFINE-ATTRIBUTE-PROCESSOR</a></code>. For tag processors you will usually want to make sure to call <code><a href="#FUNCTION%20CLIP%3APROCESS-ATT