Choice between two elements with same name - xsd

Question

I am struggling with a choice between an element that is mixed and one that is not.
<xs:group name="code">
<xs:choice>
<xs:element name="code" type="multiLineCode"/>
<xs:element name="code" type="code"/>
</xs:choice>
</xs:group>
<xs:complexType name="code" mixed="true">
<xs:group ref="htmlInlineElements" minOccurs="0" maxOccurs="unbounded"/>
</xs:complexType>
<xs:complexType name="multiLineCode">
<xs:sequence>
<xs:element name="line" maxOccurs="unbounded">
<xs:complexType mixed="true">
<xs:group ref="htmlInlineElements" minOccurs="0" maxOccurs="unbounded"/>
<xs:attribute name="indentation" use="required"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
Why do I want to do this crazy move?
The background is that mixed text in the <code> element is reformatted by the IDE so far. Since the content later moves to an HTML <pre> element there are display problems here.
existing <code> example:
<code>
if (<function>ParseInt</function>("42") === 42)
<function>doSomething</function>();
</code>
<code> example for multiline:
<code>
<line indentation="0">if (<function>ParseInt</function>("42") === 42)</line>
<line indentation="1"><function>doSomething</function>();</line>
</code>
So i want either a <code> element that's not multiline but has <line> elements or a multiline code element. As there are 670 code examples out i cannot change them all.
Do you have a solution for my choice-problem? And in general: Am i on the right way solving this problem?
Thank you very much!