XML Schema - Element with string, attribute and a sequence?

I have an element in my XML data that has an attribute AND string, as well as a child sequence. Is there anyway to correctly write a .XSD schema to validate this?

<ygg:Attr name="JournalTitleFull">Nature</ygg:Attr>
<ygg:Attr name="JournalIssue">7534</ygg:Attr>
<ygg:Attr name="DOI">10.1038/nature14094</ygg:Attr>
<ygg:Attr name="Year">2015</ygg:Attr>
<ygg:Attr name="JournalTitle">Nature</ygg:Attr>
<ygg:Attr name="Month">Jan</ygg:Attr>
<ygg:Attr name="Day">15</ygg:Attr>
<ygg:Attr name="JournalVolume">517</ygg:Attr>
<ygg:Attr name="Authors">
    <ygg:Value>Neppl, S</ygg:Value><ygg:Value>Ernstorfer, R</ygg:Value>

An excerpt from my schema is below but misses the strings of the element (i.e. Nature, 7534, 10.1038/nature14094 etc from above). Any attempt to add the strings to the element renders me unable to add either the attribute and/or child sequence.

 <xs:element name="Attr">
    <xs:complexType mixed="true">
      <xs:sequence>
        <xs:element minOccurs="0" maxOccurs="unbounded" ref="ygg:Value"/>
      </xs:sequence>
      <xs:attribute name="name" use="required" type="xs:NCName"/>
    </xs:complexType>
  </xs:element>
  <xs:element name="Value" type="xs:string"/>

Note - "ygg:Attr" is defined as a sequence earlier in the schema

Any help would be much appreciated. Please note this is a re-formulated question from earlier, as my prior question caused confusion. Thanks very much!