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diff --git a/xml/constraints.rng b/xml/constraints.rng
index 4ce74ebd6c..07de67789b 100644
--- a/xml/constraints.rng
+++ b/xml/constraints.rng
@@ -1,112 +1,116 @@
<?xml version="1.0" encoding="utf-8"?>
<grammar xmlns="http://relaxng.org/ns/structure/1.0"
datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes">
<start>
<ref name="element-constraints"/>
</start>
<define name="element-constraints">
<zeroOrMore>
<choice>
<ref name="element-location"/>
<ref name="element-colocation"/>
<ref name="element-order"/>
</choice>
</zeroOrMore>
</define>
<define name="element-location">
<element name="rsc_location">
<attribute name="id"><data type="ID"/></attribute>
<attribute name="rsc"><data type="IDREF"/></attribute>
<choice>
<group>
<externalRef href="score.rng"/>
<attribute name="node"><data type="IDREF"/></attribute>
</group>
<oneOrMore>
<externalRef href="rule.rng"/>
</oneOrMore>
</choice>
<optional>
<ref name="element-lifetime"/>
</optional>
</element>
</define>
<define name="element-colocation">
<element name="rsc_colocation">
<attribute name="id"><data type="ID"/></attribute>
- <attribute name="from"><data type="IDREF"/></attribute>
- <attribute name="to"><data type="IDREF"/></attribute>
+ <attribute name="from"><text/></attribute>
+ <attribute name="to"><text/></attribute>
+ <!-- Ideally these would be IDREFs, but that excludes colocation with individual clones
+ <attribute name="from"><data type="IDREF"/></attribute>
+ <attribute name="to"><data type="IDREF"/></attribute>
+ -->
<externalRef href="score.rng"/>
<optional>
<ref name="element-lifetime"/>
</optional>
<optional>
<attribute name="from_role">
<ref name="attribute-roles"/>
</attribute>
</optional>
<optional>
<attribute name="to_role">
<ref name="attribute-roles"/>
</attribute>
</optional>
</element>
</define>
<define name="element-order">
<element name="rsc_order">
<attribute name="id"><data type="ID"/></attribute>
<attribute name="from"><data type="IDREF"/></attribute>
<attribute name="to"><data type="IDREF"/></attribute>
<optional>
<externalRef href="score.rng"/>
</optional>
<optional>
<ref name="element-lifetime"/>
</optional>
<optional>
<attribute name="symmetrical"><data type="boolean"/></attribute>
</optional>
<optional>
<attribute name="action">
<ref name="attribute-actions"/>
</attribute>
</optional>
<optional>
<attribute name="to_action">
<ref name="attribute-actions"/>
</attribute>
</optional>
</element>
</define>
<define name="attribute-actions">
<choice>
<value>start</value>
<value>promote</value>
<value>demote</value>
<value>stop</value>
</choice>
</define>
<define name="attribute-roles">
<choice>
<value>Stopped</value>
<value>Started</value>
<value>Master</value>
<value>Slave</value>
</choice>
</define>
<define name="element-lifetime">
<element name="lifetime">
<oneOrMore>
<externalRef href="rule.rng"/>
</oneOrMore>
</element>
</define>
</grammar>

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