无法设计XSD架构-因为存在变量元素名

我并不擅长创建XSD模式,因为这实际上是我的第一个模式, 我想验证一个XML,它必须如下所示:

<?xml version="1.0"?>
<Data>
  <FIELD name='toto'>
    <META mono='false' dynamic='false'>
      <COLUMN1>
          <REFTABLE>table</REFTABLE>
          <REFCOLUMN>key_column</REFCOLUMN>
          <REFLABELCOLUMN>test_column</REFLABELCOLUMN>
      </COLUMN1>
      <COLUMN2>
          <REFTABLE>table</REFTABLE>
          <REFCOLUMN>key_column</REFCOLUMN>
          <REFLABELCOLUMN>test_column</REFLABELCOLUMN>
      </COLUMN2>
</META>
<VALUEs>
   <VALUE>...</VALUE>
</VALUEs>
</FIELD>

我的问题是,进入元块的标签“column1”、“column2”总是不同的,它可能会变成columnxxx。目前我的模式是:

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<xsd:element name="Data">
    <xsd:complexType>
   <xsd:sequence>
     <xsd:element name="FIELD" type="Field" />
    </xsd:sequence>
      <xsd:attribute name="id" type="xsd:int" use="required" />
    </xsd:complexType>
</xsd:element>

<xsd:complexType name="dataSourceDef">
    <xsd:sequence>
        <xsd:element name="DSD_REFTABLE" type="xsd:string" />
        <xsd:element name="DSD_REFCOLUMN" type="xsd:string" />
        <xsd:element name="DSD_REFLABELCOLUMN" type="xsd:string" />
    </xsd:sequence>
</xsd:complexType>

<xsd:complexType name="MetaTag">
    <xsd:sequence>
        <xsd:any processContents="lax" />
    </xsd:sequence>
    <xsd:attribute name="mono" type="xsd:string" use="required" />
    <xsd:attribute name="dynamic" type="xsd:string" use="required"/>
</xsd:complexType>

<xsd:complexType name="Field">
    <xsd:sequence>
        <xsd:element name="META" type="MetaTag" minOccurs="1" />
        <xsd:element name="VALUEs">
            <xsd:complexType>
                <xsd:sequence>
                    <xsd:any processContents="lax" />
                </xsd:sequence>
            </xsd:complexType>
        </xsd:element>
    </xsd:sequence>
    <xsd:attribute name="name" type="xsd:string" use="required"/>
</xsd:complexType>
</xsd:schema>

我就是不能让它工作,我不知道如何处理这样一个事实:我的节点的精确级别不清楚,其余的都不清楚。

你能帮我吗?