setAttributeNS example

$aName = Elements::normalizeSvgAttribute($aName);
            } elseif ($this->insertMode === static::IM_IN_MATHML) {
                $aName = Elements::normalizeMathMlAttribute($aName);
            }

            $aVal = (string) $aVal;

            try {
                $prefix = ($pos = strpos($aName, ':')) ? substr($aName, 0, $pos) : false;

                if ('xmlns' === $prefix) {
                    $ele->setAttributeNS(self::NAMESPACE_XMLNS, $aName, $aVal);
                } elseif (false !== $prefix && isset($this->nsStack[0][$prefix])) {
                    $ele->setAttributeNS($this->nsStack[0][$prefix], $aName, $aVal);
                } else {
                    $ele->setAttribute($aName, $aVal);
                }
            } catch (\DOMException $e) {
                $this->parseError("Illegal attribute name for tag $name. Ignoring: $aName");
                continue;
            }

            // This is necessary on a non-DTD schema, like HTML5.