XSD validation error in #AnonType_Apps - xsd

Question

When I tried to validate my XSD it gives the error
S4s-elt-invalid-content.1: The Content Of '#AnonType_Apps' Is Invalid.
Element 'sequence' Is Invalid, Misplaced, Or Occurs Too Often.
don't know what should be done
<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name ="Apps">
<xs:complexType>
<xs:attribute name ="List_Type" use="required">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="new releases"/>
<xs:enumeration value="top rated"/>
<xs:enumeration value="category list"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name ="Server_IP" type="xs:string" fixed="10.144.50.55"/>
<xs:sequence>
<xs:element name ="App" minOccurs="1" maxOccurs="20">
<xs:complexType>
<xs:attribute name ="device_type" use="optinal" >
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="tablet"/>
<xs:enumeration value="phone"/>
</xs:restriction>
</xs:simpleType>
</xs:attribute>
<xs:attribute name ="app_id" type="xs:string"/>
<xs:attribute name ="installed" type="xs:boolean" default="false"/>
<xs:sequence>
<xs:element name ="app_name" type="xs:string"></xs:element>
<xs:element name ="catogry" minOccurs="1" maxOccurs="3"></xs:element>
<xs:element name ="version" type="xs:string"></xs:element>
<xs:element name ="description" type="xs:string"></xs:element>
<xs:element name ="reviews" use="required">
<xs:complexType>
<xs:sequence>
<xs:element name ="review" minOccurs="0" maxOccurs="unbounded">
<xs:complexType>
<xs:all>
<xs:element name ="reviewer_name" type="xs:string"></xs:element>
<xs:element name ="review_date">
<xs:complexType>
<xs:restriction base="xs:string">
<xs:pattern value="\d{4}\-\d{2}\-\d{2}"/>
</xs:restriction>
</xs:complexType>
</xs:element>
</xs:all>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name ="review_time">
<xs:complexType>
<xs:restriction base="xs:string">
<xs:pattern value="\d{2}:\d{2}:\d{}"/>
</xs:restriction>
</xs:complexType>
</xs:element>
<xs:element name ="content" type="xs:string"></xs:element>
<xs:element name ="rating">
<xs:complexType>
<xs:restriction base="xs:float">
<xs:minInclusive value="0" />
<xs:maxInclusive value="5" />
</xs:restriction>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>

Answer 1

Within a complexType element, the content model comes first and the attribute declarations come last. Move the outermost sequence element to make it the first child of the complex type.
You might want to try finding a syntax-aware editor in which to edit schema documents, to alert you to problems of this kind.
Other syntactic issues in this fragment:
Other complexType elements have the same syntax error of putting their attribute declarations first.
If you want the type of rating to be a restriction of xs:float, then you want it to have a simple type, not a complex type.
Ditto for review_time and review_date.
The pattern on the type of review_time is not a legal regular expression: braces may contain information on the minimum and/or maximum occurrences of (strings matching) a subexpression, in a variety of forms, but they must contain something, so \d{} is not a legal expression. Drop the empty braces, or make it \d{1} if you like, or make it say what you want.
The xs:element element has no attribute named use; I think you may mean to say <xs:element name="reviews" minOccurs="1" maxOccurs="1"> ...
The use attribute does not accept the value optinal.
Get an editor!

Answer 2

Your xs:sequence element needs to follow immidiately on the complexType element.
Your review_date and review_time elements should be a simpleType with a restriction.
If you fix those issues your xsd seems validd.