reformulate sentence to clarify url records identify resources;

add change log entries

epub33/core/index.html

@@ -5402,10 +5402,9 @@ <h4>Relative URLs for Referencing Other Components</h4>
 						OCF Abstract Container and not relative to the <code>META-INF</code> directory.</p>
 
 					<p>All <a href="https://url.spec.whatwg.org/#relative-url-with-fragment-string"
-							>relative-URL-with-fragment strings</a> [[URL]] MUST identify resources within the OCF
-						Abstract Container (i.e., at or below the Root Directory) after <a
-							href="https://url.spec.whatwg.org/#concept-url-parser">parsing to URL records</a>
-						[[URL]].</p>
+							>relative-URL-with-fragment strings</a> [[URL]] MUST, after <a
+							href="https://url.spec.whatwg.org/#concept-url-parser">parsing to URL records</a> [[URL]],
+						identify resources within the OCF Abstract Container (i.e., at or below the Root Directory).</p>
 				</section>
 
 				<section id="sec-container-filenames">
@@ -9436,6 +9435,8 @@ <h3>Substantive Changes since the <a href="https://www.w3.org/TR/2021/WD-epub-33
 				-->
 
 				<ul>
+					<li>12-May-2021: Changed all references to URIs/IRIs to URLs and references to RFCs 3986 and 3987 to
+						the URL standard. See <a href="https://github.com/w3c/epub-specs/issues/808">issue 808</a>.</li>
 					<li>06-May-2021: Noted that the working group will no longer maintain the publication type and
 						collection role registries and removed dependence on the latter for validating collection types
 						(use of NMToken values remains restricted to extension specifications). The registry of

epub33/rs/index.html

@@ -2145,6 +2145,11 @@ <h3>Substantive Changes since the <a href="https://www.w3.org/TR/2021/WD-epub-rs
 				-->
 
 				<ul>
+					<li>12-May-2021: Added additional requirement that Reading Systems ignore property values that
+						expand to invalid URL strings and property values with empty references. See <a
+							href="https://github.com/w3c/epub-specs/issues/1673">issue 1673</a>.</li>
+					<li>12-May-2021: Changed all references to URIs/IRIs to URLs and references to RFCs 3986 and 3987 to
+						the URL standard. See <a href="https://github.com/w3c/epub-specs/issues/808">issue 808</a>.</li>
 					<li>06-May-2021: Recommend that Reading Systems support references to HTML target elements and SVG
 						fragment identifiers in <code>textref</code> attributes and the <code>text</code> element's
 							<code>src</code> attribute. Support for other fragment identifier schemes is optional. See