65     protected $scheme = null;  variable in SimplePie\\IRI
203         if ($return === null && isset($this->normalization[$this->scheme][$name])) {
204             return $this->normalization[$this->scheme][$name];
269         } elseif ($relative->scheme !== null) {
275             if ($base->scheme !== null && $base->is_valid()) {
279                         $target->scheme = $base->scheme;
282                         $target->scheme = $base->scheme;
653 … (isset($this->normalization[$this->scheme]['iuserinfo']) && $this->iuserinfo === $this->normaliza…
656 …if (isset($this->normalization[$this->scheme]['ihost']) && $this->ihost === $this->normalization[$…
659 …if (isset($this->normalization[$this->scheme]['port']) && $this->port === $this->normalization[$th…
662 …if (isset($this->normalization[$this->scheme]['ipath']) && $this->ipath === $this->normalization[$…
665 …if (isset($this->normalization[$this->scheme]['iquery']) && $this->iquery === $this->normalization…
668 … (isset($this->normalization[$this->scheme]['ifragment']) && $this->ifragment === $this->normaliza…
697         if (!$this->scheme && !$isauthority &&
729                 $this->scheme,
754             $this->scheme,
771      * @param string $scheme
774     public function set_scheme($scheme)  argument
776         if ($scheme === null) {
777             $this->scheme = null;
778         } elseif (!preg_match('/^[A-Za-z][0-9A-Za-z+\-.]*$/', $scheme)) {
779             $this->scheme = null;
782             $this->scheme = strtolower($scheme);
955             $this->ipath = $cache[$ipath][(int) ($this->scheme !== null)];
961             $this->ipath =  ($this->scheme !== null) ? $removed : $valid;
1037         if ($this->scheme !== null) {
1038             $iri .= $this->scheme . ':';
1045 …} elseif (!empty($this->normalization[$this->scheme]['ipath']) && $iauthority !== null && $iauthor…
1046             $iri .= $this->normalization[$this->scheme]['ipath'];