BPMN2 — XML-Schema type for 'from' and 'to' elements in Data Assignment must not be abstract

The XML-Schema type for elements "from" and "to" in complex type "tAssignment" is
"tBaseElementWithMixedContent". However this type is declared abstract and forces to specify
a xsi:type attribute for elements "from" and "to".
The proposal is to use a non-abstract XML-schema type for "from" and "to" elements. A good
candidate would be "tExpression" which is a non-abstract extension of "tBaseElementWithMixedContent":
<xsd:complexType name="tAssignment">
<xsd:complexContent>
<xsd:extension base="tBaseElement">
<xsd:sequence>
<xsd:element name="from" type="tExpression" minOccurs="1" maxOccurs="1"/>
<xsd:element name="to" type="tExpression" minOccurs="1" maxOccurs="1"/>
</xsd:sequence>
<xsd:attribute name="language" type="xsd:anyURI"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>

1. Spec table 10.58
a. Remove attribute "language".
b. Modify attributes "from" and "to". Make both of type "Expression". Remove "body of the" from the attribute descriptions.
2. XSD
a. Remove attribute "language".
b. Change the type of the "from" and "to" attributes in tAssignment to tExpression.
c. Modify XSD snippet in Table 10.63 to match.
3. UML metamodel
a. Remove attribute "language".
b. Change the "from" and "to" attributes in the Assignment class to be of type Expression.
c. Replace Figure 10.61.
Disposition: Resolved