Add clarification about "adjacent keywords"

Author: handrews

jsonschema-core.xml

@@ -304,6 +304,9 @@
                 <t>
                     A JSON Schema MUST be an object or a boolean.
                 </t>
+                <t>
+                    Keywords within the same schema object are referred to as adjacent keywords.
+                </t>
                 <section title="JSON Schema Objects and Keywords">
                     <t>
                         Object properties that are applied to the instance are called keywords,
@@ -674,7 +677,8 @@
             <section title="Keyword Interactions">
                 <t>
                     Keyword behavior MAY be defined in terms of the annotation results
-                    of <xref target="root">subschemas</xref> and/or adjacent keywords.
+                    of <xref target="root">subschemas</xref> and/or adjacent keywords
+                    (keywords within the same schema object) and their subschemas.
                     Such keywords MUST NOT result in a circular dependency.
                     Keywords MAY modify their behavior based on the presence or absence
                     of another keyword in the same