如何用Google APIs和Google的應用系統進行整合(5)----如何把Google Tasks的JSON Schema轉換成XML的Schema(XSD)？

標籤：google apis   google tasks   xsd schema   

前面說了一些Google API的介紹，但是在實際的開發當中，我們可能需要把Google RESTful API返回的JSON資料轉換成XML資料輸入到第三方系統，這在公司專屬應用程式整合裡面非常的常見。那麼裡面就有一個問題，如何確保轉換後的XML資料格式是規範的，這就需要XML Schema(XML)來進行校正。現在關鍵是，我們只知道Google API的JSON的schema，但是Google RESTful並沒有提供返回資料的XML的schema，那麼XML的Schema將會是什麼樣子的呢？讓我以Google Tasks API為例子。從下面的URL我們可以看到Google Tasks RESTFul的API JSON Schema的資訊：https://www.googleapis.com/discovery/v1/apis/tasks/v1/rest

 

 

 

那麼，如何把Google Tasks的JSON Schema轉換成XML的XSD Schema？XML的Schema將會是什麼樣子的呢？請參考下面轉換實現。

<?xml version='1.0' encoding='UTF-8'?><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">    <xs:complexType name="Task">        <xs:sequence>            <xs:element name="completed" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="deleted" form="unqualified" type="xs:boolean" minOccurs="0"/>            <xs:element name="due" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="etag" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="hidden" form="unqualified" type="xs:boolean" minOccurs="0"/>            <xs:element name="id" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="kind" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="links" form="unqualified" type="Tasklinks" minOccurs="0" maxOccurs="unbounded"/>            <xs:element name="notes" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="parent" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="position" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="selfLink" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="status" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="title" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="updated" form="unqualified" type="xs:string" minOccurs="0"/>        </xs:sequence>    </xs:complexType>    <xs:complexType name="TaskList">        <xs:sequence>            <xs:element name="etag" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="id" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="kind" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="selfLink" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="title" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="updated" form="unqualified" type="xs:string" minOccurs="0"/>        </xs:sequence>    </xs:complexType>    <xs:complexType name="TaskLists">        <xs:sequence>            <xs:element name="etag" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="items" form="unqualified" type="TaskList" minOccurs="0" maxOccurs="unbounded"/>            <xs:element name="kind" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="nextPageToken" form="unqualified" type="xs:string" minOccurs="0"/>        </xs:sequence>    </xs:complexType>    <xs:complexType name="Taskitems">        <xs:sequence>            <xs:element name="description" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="link" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="type" form="unqualified" type="xs:string" minOccurs="0"/>        </xs:sequence>    </xs:complexType>    <xs:complexType name="Tasklinks">        <xs:sequence>            <xs:element name="items" form="unqualified" type="Taskitems" minOccurs="0" maxOccurs="unbounded"/>        </xs:sequence>    </xs:complexType>    <xs:complexType name="Tasks">        <xs:sequence>            <xs:element name="etag" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="items" form="unqualified" type="Task" minOccurs="0" maxOccurs="unbounded"/>            <xs:element name="kind" form="unqualified" type="xs:string" minOccurs="0"/>            <xs:element name="nextPageToken" form="unqualified" type="xs:string" minOccurs="0"/>        </xs:sequence>    </xs:complexType>    <xs:element name="Task" type="Task"/>    <xs:element name="TaskList" type="TaskList"/>    <xs:element name="TaskLists" type="TaskLists"/>    <xs:element name="Tasks" type="Tasks"/></xs:schema>