[MAINTENANCE] Use getFirstValue() function

src/Mods/Element/Common/BaseElement.php

@@ -107,7 +107,7 @@ protected function getLanguageElement(string $xpath): ?LanguageElement
     {
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new LanguageElement($element->getValues()[0]);
+            return new LanguageElement($element->getFirstValue());
         }
         return null;
     }

src/Mods/Element/Location.php

@@ -83,7 +83,7 @@ public function getShelfLocator(string $query = ''): ?LanguageElement
         $xpath = './mods:shelfLocator' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new LanguageElement($element->getValues()[0]);
+            return new LanguageElement($element->getFirstValue());
         }
         return null;
     }
@@ -124,7 +124,7 @@ public function getHoldingSimple(string $query = ''): ?HoldingSimple
         $xpath = './mods:holdingSimple' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new HoldingSimple($element->getValues()[0]);
+            return new HoldingSimple($element->getFirstValue());
         }
         return null;
     }
@@ -144,7 +144,7 @@ public function getHoldingExternal(string $query = ''): string
         $xpath = './mods:holdingExternal' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return $element->getValues()[0]->asXML();
+            return $element->getFirstValue()->asXML();
         }
         return '';
     }

src/Mods/Element/Name.php

@@ -98,7 +98,7 @@ public function getEtal(string $query = ''): ?LanguageElement
         $xpath = './mods:etal' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new LanguageElement($element->getValues()[0]);
+            return new LanguageElement($element->getFirstValue());
         }
         return null;
     }

src/Mods/Element/Specific/Location/HoldingSimple/CopyInformation.php

@@ -58,7 +58,7 @@ public function getForm(string $query = ''): ?Form
         $xpath = './mods:form' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new Form($element->getValues()[0]);
+            return new Form($element->getFirstValue());
         }
         return null;
     }

src/Mods/Element/Specific/Part/Extent.php

@@ -97,7 +97,7 @@ public function getTotal(string $query = ''): int
         $xpath = './mods:total' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return (int) $element->getValues()[0];
+            return (int) $element->getFirstValue();
         }
         return 0;
     }

src/Mods/Element/Specific/RecordInfo/LanguageOfCataloging.php

@@ -73,7 +73,7 @@ public function getLanguageTerm(string $query = ''): ?LanguageTerm
         $xpath = './mods:languageTerm' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new LanguageTerm($element->getValues()[0]);
+            return new LanguageTerm($element->getFirstValue());
         }
         return null;
     }
@@ -93,7 +93,7 @@ public function getScriptTerm(string $query = ''): ?ScriptTerm
         $xpath = './mods:scriptTerm' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new ScriptTerm($element->getValues()[0]);
+            return new ScriptTerm($element->getFirstValue());
         }
         return null;
     }

src/Mods/Element/TitleInfo.php

@@ -101,7 +101,7 @@ public function getTitle(string $query = ''): ?LanguageElement
         $xpath = './mods:title' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new LanguageElement($element->getValues()[0]);
+            return new LanguageElement($element->getFirstValue());
         }
         return null;
     }
@@ -121,7 +121,7 @@ public function getSubTitle(string $query = ''): ?LanguageElement
         $xpath = './mods:subTitle' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new LanguageElement($element->getValues()[0]);
+            return new LanguageElement($element->getFirstValue());
         }
         return null;
     }
@@ -141,7 +141,7 @@ public function getPartNumber(string $query = ''): ?LanguageElement
         $xpath = './mods:partNumber' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new LanguageElement($element->getValues()[0]);
+            return new LanguageElement($element->getFirstValue());
         }
         return null;
     }
@@ -181,7 +181,7 @@ public function getNonSort(string $query = ''): ?NonSort
         $xpath = './mods:nonSort' . $query;
         $element = new Element($this->xml, $xpath);
         if ($element->exists()) {
-            return new NonSort($element->getValues()[0]);
+            return new NonSort($element->getFirstValue());
         }
         return null;
     }

src/Mods/Reader/AbstractReader.php

@@ -59,7 +59,7 @@ public function getAbstractByParameters(string $query = '', array $attributes =
         $query = new Query('./mods:abstract', $query, $attributes, $value);
         $element = new Element($this->xml, $query->getXPath());
         if ($element->exists()) {
-            return new AbstractElement($element->getValues()[0]);
+            return new AbstractElement($element->getFirstValue());
         }
         return null;
     }