WIP.
diff --git a/built-components.html b/built-components.html
index 6cef122..055acb9 100644
--- a/built-components.html
+++ b/built-components.html
@@ -172,6 +172,37 @@
It describes list of <a href="apis/latest/org/apache/nlpcraft/nlp/parsers/NCSemanticElement.html">NCSemanticElement</a>
which are represented <a href="https://en.wikipedia.org/wiki/Named-entity_recognition">Named entities</a>.
</p>
+
+ <p>
+ Each <a href="apis/latest/org/apache/nlpcraft/nlp/parsers/NCSemanticElement.html">NCSemanticElement</a>
+ is presented by <code>id</code>, <code>groups</code>, <code>synonyms</code>, <code>values</code> and <code>properties</code>.
+ <p>
+
+ <section id="element-synonyms">
+ <h3>Element synonyms</h3>
+ <p>TODO...</p>
+ </section>
+
+ <section id="element-values">
+ <h3>Element values</h3>
+ <p>TODO...</p>
+ </section>
+
+ <section id="element-groups">
+ <h3>Element values</h3>
+ <p>TODO...</p>
+ </section>
+
+ <section id="element-macros">
+ <h3>Element macros</h3>
+ <p>TODO...</p>
+ </section>
+
+ <section id="external-declaration">
+ <h3>External JSON/YAML Declaration</h3>
+ <p>TODO...</p>
+ </section>
+
</section>
<section id="examples">
