Add strikethrough as text rendering option

schema/frus.odd

@@ -1527,6 +1527,9 @@
                                     <valItem ident="underline">
                                         <gloss>Underline</gloss>
                                     </valItem>
+                                    <valItem ident="strikethrough">
+                                        <gloss>Strikethrough</gloss>
+                                    </valItem>
                                     <valItem ident="sub">
                                         <gloss>Subscript</gloss>
                                     </valItem>

schema/frus.rnc

@@ -1164,6 +1164,9 @@ hi =
       | 
         ## (Underline) 
         "underline"
+      | 
+        ## (Strikethrough) 
+        "strikethrough"
       | 
         ## (Subscript) 
         "sub"

schema/frus.sch

@@ -139,9 +139,9 @@
         <title>Rend Attribute Value Checks</title>
         <rule context="tei:hi">
             <assert
-                test="./@rend = ('strong', 'italic', 'smallcaps', 'roman', 'underline', 'sub', 'superscript')"
+                test="./@rend = ('strong', 'italic', 'smallcaps', 'roman', 'underline', 'strikethrough', 'sub', 'superscript')"
                     >hi/@rend='<value-of select="@rend"/>' is an invalid value. Only the following
-                values are allowed: strong, italic, smallcaps, roman, underline, sub,
+                values are allowed: strong, italic, smallcaps, roman, underline, strikethrough, sub,
                 superscript</assert>
         </rule>
         <rule context="tei:p">
@@ -415,6 +415,57 @@
         </rule>
     </pattern>
 
+    <pattern id="signed-checks">
+        <title>Signature block checks</title>
+        <rule context="tei:closer">
+            <assert test="not(following-sibling::tei:closer)" id="multiple-closers" role="warn"
+                >Multiple consecutive signature blocks should be combined into a single
+                closer.</assert>
+            <assert test="count(tei:signed) eq 1" id="closer-multiple-signed" role="warn">A closer
+                should only have one child signed element</assert>
+        </rule>
+        <rule context="tei:signed">
+            <assert test="not(@corresp)" id="signed-corresp">The @corresp attribute is not allowed
+                on the signed element; it should be moved to the persName inside the signed
+                element</assert>
+            <assert test=".//tei:persName[not(ancestor::tei:note)]" id="signed-persname">Signature
+                blocks must contain a persName</assert>
+            <assert test="not(.//tei:affiliation)" id="affiliation" role="warn">The affiliation
+                element is not allowed.</assert>
+        </rule>
+        <rule context="tei:signed//tei:persName[not(ancestor::tei:note)]">
+            <assert
+                test="empty(.) or tei:hi[@rend eq 'strong'] or tei:hi[@rend eq 'italic' and contains(normalize-space(.), 'name not declassified')]"
+                role="warn" id="persnames-child-hi-rend-strong">People who signed must be wrapped in
+                a hi/@rend="strong" element</assert>
+            <let name="immediate-following-sibling-node"
+                value="following-sibling::node()[not(name() = ('note', 'lb') or normalize-space(.) eq '')][1]"/>
+            <assert
+                test="empty($immediate-following-sibling-node) or (matches(normalize-space($immediate-following-sibling-node), '^\p{P}*$') or $immediate-following-sibling-node/self::tei:hi/@rend eq 'italic')"
+                id="persnames-siblings-italics">Text following a persName element must be wrapped in
+                a hi/@rend="italic" element, not an affiliation element; be sure any line breaks are
+                marked with lb elements</assert>
+            <let name="immediate-preceding-sibling-text-node"
+                value="preceding-sibling::text()[not(normalize-space(.) eq '')][1]"/>
+            <assert
+                test="empty($immediate-preceding-sibling-text-node) or matches(normalize-space($immediate-preceding-sibling-text-node), '^\p{P}*$')"
+                id="first-name" role="warn">There should be no untagged text nodes in signed
+                elements before a persName.</assert>
+            <let name="following-italicized-text"
+                value="following-sibling::tei:hi[@rend eq 'italic']"/>
+            <let name="following-linebreaks" value="following-sibling::tei:lb"/>
+            <assert
+                test="($following-italicized-text and $following-linebreaks) or (empty($following-italicized-text) and empty($following-linebreaks))"
+                id="insert-linebreaks">Any persName elements followed by italicized text should be
+                separated by lb elements.</assert>
+            <assert
+                test="not(following-sibling::tei:persName) or contains-token(ancestor::tei:signed/@ana, '#signed-exception_multiple-consecutive-persnames')"
+                role="warn" id="persname-multiple">This may need to be adapted to a list/item
+                structure (or given a signed-exception @ana value for multiple consecutive
+                persNames)</assert>
+        </rule>
+    </pattern>
+
     <pattern id="milestone-checks">
         <title>Milestone checks</title>
         <rule