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 This section defines the inputs and outputs of the <a>DID resolution</a> and
 <a>DID URL dereferencing</a> processes. The exact implementation of these
 functions is out of scope for this specification, but some considerations for
-implementors are available in [[?DID-RESOLUTION]].
+implementors are discussed in [[?DID-RESOLUTION]].
+    </p>
+
+    <p>
+All conformant <a>DID resolvers</a> MUST implement the <a>DID resolution</a> function
+for at least one <a>DID method</a> and MUST be able to return a <a>DID document</a> in 
+at least one conformant representation.
     </p>
 
     <section>
         <h2>
 DID Resolution
         </h2>
+        <p>
+The <a>DID resolution</a> function resolves a <a>DID</a> into a <a>DID document</a>
+by using the "Read" operation of the applicable <a>DID method</a>. (See <a href="#read-verify"></a>.)
+The details of how this process is accomplished are outside the scope of this
+specification, but all conformant implementations MUST implement a function in the following form:
+        </p>
+
+        <p><code>
+resolve ( did, did-resolution-input-metadata ) <br>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-&gt; ( did-resolution-metadata, did-document-stream, did-document-metadata )
+        </code></p>
+
+        <p>
+The input variables of this function MUST be as follows:
+        </p>
+
+        <dl>
+            <dt>
+did
+            </dt>
+            <dd>
+A conformant <a>DID</a> as a single string. This is the <a>DID</a> to resolve.
+This input is REQUIRED.
+            </dd>
+            <dt>
+did-resolution-input-metadata
+            </dt>
+            <dd>
+A <a href="metadata-structure">metadata structure</a> consisting of input options to the <code>resolve</code>
+function in addition to the <code>did</code> itself.
+Properties defined by this specification are in <a href="#did-resolution-input-metadata-properties"></a>.
+This input is REQUIRED, but the structure MAY be empty.
+            </dd>
+        </dl>
+
+        <p>
+The output variables of this function MUST be as follows:
+        </p>
+    
+        <dl>
+            <dt>
+did-resolution-metadata
+            </dt>
+            <dd>
+A <a href="metadata-structure">metadata structure</a> consisting of values relating to the results of the <a>DID resolution</a> process.
+This structure is REQUIRED and MUST NOT be empty.
+This metadata typically changes between invocations of the <code>resolve</code> function as it represents data about the resolution process itself.
+Properties defined by this specification are in <a href="#did-resolution-metadata-properties"></a>.
+If the resolution is successful, this structure MUST contain a <code>content-type</code> property containing the mime-type <a>representation</a> of the <code>did-document-stream</code> in this result.
+If the resolution is not successful, this structure MUST contain an <code>error</code> property describing the error.
+            </dd>
+            <dt>
+did-document-stream
+            </dt>
+            <dd>
+If the resolution is successful, this MUST be a byte stream of the resolved <a>DID document</a> in a single conformant <a>representation</a>.
+The byte stream MAY then be parsed by the caller of the <code>resolve</code> function into a <a>DID document</a> abstract data model, which
+can in turn be validated and processed.
+If the resolution is unsuccessful, this value MUST be an empty stream.
+            </dd>
+            <dt>
+did-document-metadata
+            </dt>
+            <dd>
+If the resolution is successful, this MUST be a <a href="metadata-structure">metadata structure</a>.
+This structure contains metadata about the <a>DID document</a> contained in the <code>did-document-stream</code>.
+This metadata typically does not change between invocations of the <code>resolve</code> function unless
+the <a>DID document</a> changes, as it represents data about the <a>DID document</a>.
+If the resolution is unsuccessful, this output MUST be an empty <a href="metadata-structure">metadata structure</a>.
+Properties defined by this specification are in <a href="#did-document-metadata-properties"></a>.
+            </dd>
+        </dl>
+
+        <p>
+<a>DID resolver</a> implementations MUST NOT alter the signature of this function in any way. <a>DID resolver</a>
+implementations MAY map the <code>resolve</code> function to a method-specific internal function to perform the
+actual <a>DID resolution</a> process. <a>DID resolver</a> implementations <a>DID resolver</a> implementations MAY implement 
+and expose additional functions with different signatures in addition to the <code>resolve</code> function specified here.
+        </p>
+
+        <section>
+            <h3>
+DID Resolution Input Metadata Properties
+            </h3>
+            
+            <p>
+The possible properties within this structure and their possible values are defined by [[DID-CORE-REGISTRIES]].
+This specification defines the following common properties.
+            </p>
+            
+            <dl>
+                <dt>
+accept
+                </dt>
+                <dd>
+The MIME type of the caller's preferred representation of the <a>DID document</a>. The <a>DID resolver</a> implementation 
+MAY use this value to determine the representation contained in the returned <code>did-document-stream</code> if such
+a representation is supported and available. This property is OPTIONAL.
+                </dd>
+            </dl>
+        </section>
+
+        <section>
+            <h3>
+DID Resolution Metadata Properties
+            </h3>
+            
+            <p>
+The possible properties within this structure and their possible values are defined by [[DID-CORE-REGISTRIES]].
+This specification defines the following common properties.
+            </p>
+
+            <dl>
+                <dt>
+content-type
+                </dt>
+                <dd>
+The mime-type of the returned conformant representation of the contained in the returned <code>did-document-stream</code>.
+This property is REQUIRED if resolution is successful and a <code>did-document-stream</code> is returned. 
+The caller of the <code>resolve</code> function MUST use this value when determining how to
+parse and process the <code>did-document-stream</code> returned by this function into a
+<a>DID document</a> abstract data model.
+                </dd>
+                <dt>
+error
+                </dt>
+                <dd>
+The error code from the resolution process. 
+This property is REQUIRED when there is an error in the resolution process.
+The value of this property is a single keyword string.
+The possible property values of this field are defined by the DID Core Registry [[DID-CORE-REGISTRY]]. 
+This specification defines the following error values:
+                    <dl>
+                        <dt>
+invalid-did
+                        </dt>
+                        <dd>
+The <a>DID</a> supplied to the <a>DID resolution</a> function does not
+conform to valid syntax. (See <a href="#did-syntax"></a>.)
+                        </dd>
+                        <dt>
+unauthorized
+                        </dt>
+                        <dd>
+The caller is not authorized to resolve this <a>DID</a> with
+this <a>DID resolver</a>.
+                        </dd>
+                        <dt>
+not-found
+                        </dt>
+                        <dd>
+The <a>DID resolver</a> was unable to return the <a>DID document</a>
+resulting from this resolution request.
+                        </dd>
+                    </dl>
+                </dd>
+            </dl>
+
+        </section>
+
+        <section>
+            <h3>
+DID Document Metadata Properties
+            </h3>
+            
+            <p>
+The possible properties within this structure and their possible values are defined by [[DID-CORE-REGISTRIES]].
+This specification defines the following common properties.
+            </p>
+
+        </section>
+
     </section>
 
     <section>
@@ -2706,6 +2884,31 @@ <h2>
         <h2>
 Metadata Structure
         </h2>
+
+        <p>
+A <a href="metadata-structure">metadata structure</a> is a common and interoperable data structure used to
+communicate information alongside a <a>DID</a> and <a>DID document</a>, and is specifically
+used for the <a>DID resolution</a> function definition in this specification.
+Use of a <a href="metadata-structure">metadata structure</a> is intended to compliment the information available
+within a <a>DID</a> or <a>DID document</a>, and therefore is best suited to carrying
+metadata as an input or output to the function process.
+        </p>
+        
+        <p>
+A <a href="metadata-structure">metadata structure</a> consists of a set of properties.
+Each property has a single name and a single value.
+The name of the property MUST be a single string. 
+Property names MUST be unique within a given set. 
+Each property name MUST map unambiguously to a single value within the set.
+Property names MUST be compared by the exact byte value.
+The value of a property MUST be a single string.
+The value of a property MAY be an empty string.
+Properties with null or equivalent values MUST be treated as
+equivalent to omitted properties within a given set.
+Property values MAY be repeated under different property names within a given set.
+Property definitions MAY impose additional constraints on the property value, so long as
+those constraints allow for unambiguous representation as a single string.
+        </p>
     </section>
 
   </section>