Changed dependency to use a ComplexType.

Removed use of `ref` to a global element.  Details in issue #305.

src/test/resources/eml-software-220.xml

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<eml:eml xmlns:eml="eml://ecoinformatics.org/eml-2.2.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         packageId="eml-1.2" system="knb"
+         xsi:schemaLocation="eml://ecoinformatics.org/eml-2.2.0 xsd/eml.xsd">
+         <software>
+             <alternateIdentifier>eml2</alternateIdentifier>
+             <title>eml2: Create and Manipulate Data using the Ecological Metadata Language</title>
+             <creator id="http://orcid.org/0000-0002-1642-628X">
+                 <individualName>
+                     <givenName>Carl</givenName>
+                     <surName>Boettiger</surName>
+                 </individualName>
+                 <address/>
+                 <electronicMailAddress>cboettig@gmail.com</electronicMailAddress>
+             </creator>
+             <abstract>A successor to the 'EML' R package which provides the same high level
+                 functions for creating and extracting data from 'EML' files, while
+                 providing a simpler and more user friendly lower level interface.
+             </abstract>
+             <implementation>
+                 <distribution>
+                     <online>
+                         <url>https://github.com/cboettig/eml2</url>
+                     </online>
+                 </distribution>
+                 <size>466.612KB</size>
+                 <programmingLanguage>R 3.5.0</programmingLanguage>
+             </implementation>
+             <dependency>
+                 <action>install</action>
+                 <software>
+                     <alternateIdentifier>xml2</alternateIdentifier>
+                     <title>xml2</title>
+                     <creator>
+                         <references>http://orcid.org/0000-0002-1642-628X</references>
+                     </creator>
+                     <implementation>
+                         <distribution>
+                             <online>
+                                 <url>https://github.com/cboettig/eml2</url>
+                             </online>
+                         </distribution>
+                         <size>466.612KB</size>
+                         <programmingLanguage>R 3.5.0</programmingLanguage>
+                     </implementation>
+                     <licenseURL>https://spdx.org/licenses/MIT</licenseURL>
+                     <version>1.4</version>
+                 </software>
+             </dependency>
+             <licenseURL>https://spdx.org/licenses/MIT</licenseURL>
+             <version>xxx</version>
+         </software>
+</eml:eml>

xsd/eml-software.xsd

@@ -285,7 +285,7 @@
                   </xs:appinfo>
                 </xs:annotation>
               </xs:element>
-              <xs:element ref="dependency" minOccurs="0" maxOccurs="unbounded">
+              <xs:element name="dependency" type="DependencyType" minOccurs="0" maxOccurs="unbounded">
                 <xs:annotation>
                   <xs:appinfo>
                     <doc:tooltip>dependency</doc:tooltip>
@@ -299,7 +299,7 @@
             </xs:sequence>
           </xs:complexType>
         </xs:element>
-        <xs:element ref="dependency" minOccurs="0" maxOccurs="unbounded">
+        <xs:element name="dependency" type="DependencyType" minOccurs="0" maxOccurs="unbounded">
           <xs:annotation>
             <xs:appinfo>
               <doc:tooltip>dependency</doc:tooltip>
@@ -380,22 +380,21 @@
       <xs:enumeration value="assert"/>
     </xs:restriction>
   </xs:simpleType>
-  <xs:element name="dependency">
-    <xs:annotation>
-      <xs:appinfo>
-        <doc:tooltip>Dependency</doc:tooltip>
-        <doc:summary>Dependency describes the software package(s) that the
-        software package is dependent upon.</doc:summary>
-        <doc:description>The dependency element is recursive. It is a
-        sub-element of the software Element but it also has as a sub-element
-        its parent element Software Package. Dependency has been made optional
-        because to make it mandatory does not allow the recursion to end.
-        Dependency has also been made a sub-element of implementation because
-        there can be both implementation and package level dependencies within
-        a package.</doc:description>
-      </xs:appinfo>
-    </xs:annotation>
-    <xs:complexType>
+  <xs:complexType name="DependencyType">
+      <xs:annotation>
+        <xs:appinfo>
+          <doc:tooltip>Dependency</doc:tooltip>
+          <doc:summary>Dependency describes the software package(s) that the
+          software package is dependent upon.</doc:summary>
+          <doc:description>The dependency element is recursive. It is a
+          sub-element of the software Element but it also has as a sub-element
+          its parent element Software Package. Dependency has been made optional
+          because to make it mandatory does not allow the recursion to end.
+          Dependency has also been made a sub-element of implementation because
+          there can be both implementation and package level dependencies within
+          a package.</doc:description>
+        </xs:appinfo>
+      </xs:annotation>
       <xs:sequence>
         <xs:element name="action" type="Action">
           <xs:annotation>
@@ -415,8 +414,8 @@
             </xs:appinfo>
           </xs:annotation>
         </xs:element>
-        <xs:element ref="software"/>
+        <xs:element name="software" type="SoftwareType"/>
       </xs:sequence>
-    </xs:complexType>
-  </xs:element>
+  </xs:complexType>
+  <xs:element name="dependency" type="DependencyType"/>
 </xs:schema>