Die XML-Datei ist gültig.

DTDParser\DTD Object
(
    [elements] => Array
        (
            [bibliothek] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => bibliothek
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => medium
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

            [medium] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => medium
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => buch
                            [1] => zeitschrift
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                            [typ] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => typ
                                    [type:DTDParser\Attribute:private] => (buch | zeitschrift)
                                    [value:DTDParser\Attribute:private] => #REQUIRED
                                    [raw:DTDParser\Attribute:private] => 
                                )

                            [status] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => status
                                    [type:DTDParser\Attribute:private] => (verfuegbar | ausgeliehen)
                                    [value:DTDParser\Attribute:private] => "verfuegbar"
                                    [raw:DTDParser\Attribute:private] => 
                                )

                            [id] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => id
                                    [type:DTDParser\Attribute:private] => ID
                                    [value:DTDParser\Attribute:private] => #REQUIRED
                                    [raw:DTDParser\Attribute:private] => 
                                )

                            [leihfrist] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => leihfrist
                                    [type:DTDParser\Attribute:private] => CDATA
                                    [value:DTDParser\Attribute:private] => #IMPLIED
                                    [raw:DTDParser\Attribute:private] => 
                                )

                        )

                )

            [buch] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => buch
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => isbn
                            [1] => titel
                            [2] => autor
                            [3] => jahr
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                            [ausgabeNr] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => ausgabeNr
                                    [type:DTDParser\Attribute:private] => CDATA
                                    [value:DTDParser\Attribute:private] => #IMPLIED
                                    [raw:DTDParser\Attribute:private] => 
                                )

                            [genre] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => genre
                                    [type:DTDParser\Attribute:private] => (fiction | nonfiction | referenz)
                                    [value:DTDParser\Attribute:private] => "fiction"
                                    [raw:DTDParser\Attribute:private] => 
                                )

                            [sprache] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => sprache
                                    [type:DTDParser\Attribute:private] => CDATA
                                    [value:DTDParser\Attribute:private] => #FIXED "Deutsch"
                                    [raw:DTDParser\Attribute:private] => 
                                )

                        )

                )

            [zeitschrift] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => zeitschrift
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => issn
                            [1] => titel
                            [2] => ausgabe
                            [3] => thema
                            [4] => jahr
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                            [frequenz] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => frequenz
                                    [type:DTDParser\Attribute:private] => (taeglich | woechentlich | monatlich | jaehrlich)
                                    [value:DTDParser\Attribute:private] => "monatlich"
                                    [raw:DTDParser\Attribute:private] => 
                                )

                            [sprache] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => sprache
                                    [type:DTDParser\Attribute:private] => CDATA
                                    [value:DTDParser\Attribute:private] => #FIXED "Deutsch"
                                    [raw:DTDParser\Attribute:private] => 
                                )

                            [sonderausgabe] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => sonderausgabe
                                    [type:DTDParser\Attribute:private] => CDATA
                                    [value:DTDParser\Attribute:private] => #IMPLIED
                                    [raw:DTDParser\Attribute:private] => 
                                )

                        )

                )

            [isbn] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => isbn
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => #PCDATA
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

            [issn] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => issn
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => #PCDATA
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

            [titel] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => titel
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => #PCDATA
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

            [autor] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => autor
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => vorname
                            [1] => nachname
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                            [mitgliedsnummer] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => mitgliedsnummer
                                    [type:DTDParser\Attribute:private] => CDATA
                                    [value:DTDParser\Attribute:private] => #IMPLIED
                                    [raw:DTDParser\Attribute:private] => 
                                )

                            [rolle] => DTDParser\Attribute Object
                                (
                                    [name:DTDParser\Attribute:private] => rolle
                                    [type:DTDParser\Attribute:private] => (autor | coautor | uebersetzer)
                                    [value:DTDParser\Attribute:private] => #IMPLIED
                                    [raw:DTDParser\Attribute:private] => 
                                )

                        )

                )

            [vorname] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => vorname
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => #PCDATA
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

            [nachname] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => nachname
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => #PCDATA
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

            [ausgabe] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => ausgabe
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => #PCDATA
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

            [thema] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => thema
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => #PCDATA
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

            [jahr] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => jahr
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => #PCDATA
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

            [jahr2] => DTDParser\Element Object
                (
                    [name:DTDParser\Element:private] => jahr2
                    [content:DTDParser\Element:private] => Array
                        (
                            [0] => EMPTY
                        )

                    [raw:DTDParser\Element:private] => 
                    [attributes:DTDParser\Element:private] => Array
                        (
                        )

                )

        )

    [entities] => Array
        (
            [publikationstypen] => DTDParser\Entity Object
                (
                    [name:DTDParser\Entity:private] => publikationstypen
                    [value:DTDParser\Entity:private] => "buch"
                    [raw:DTDParser\Entity:private] => 
                )

            [sprachen] => DTDParser\Entity Object
                (
                    [name:DTDParser\Entity:private] => sprachen
                    [value:DTDParser\Entity:private] => "Deutsch | Englisch | Französisch"
                    [raw:DTDParser\Entity:private] => 
                )

            [genreTypen] => DTDParser\Entity Object
                (
                    [name:DTDParser\Entity:private] => genreTypen
                    [value:DTDParser\Entity:private] => "fiction | nonfiction | referenz"
                    [raw:DTDParser\Entity:private] => 
                )

            [frequenzen] => DTDParser\Entity Object
                (
                    [name:DTDParser\Entity:private] => frequenzen
                    [value:DTDParser\Entity:private] => "täglich | wöchentlich | monatlich | jährlich"
                    [raw:DTDParser\Entity:private] => 
                )

            [rollen] => DTDParser\Entity Object
                (
                    [name:DTDParser\Entity:private] => rollen
                    [value:DTDParser\Entity:private] => "autor | coautor | übersetzer"
                    [raw:DTDParser\Entity:private] => 
                )

            [writer] => DTDParser\Entity Object
                (
                    [name:DTDParser\Entity:private] => writer
                    [value:DTDParser\Entity:private] => SYSTEM
 "https://www.w3schools.com/entities.dtd"
                    [raw:DTDParser\Entity:private] => 
                )

        )

    [path] => test.dtd
)