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diff --git a/org.argeo.slc.spring/src/org/argeo/slc/core/execution/xml/slc-flow-1.2.xsd b/org.argeo.slc.spring/src/org/argeo/slc/core/execution/xml/slc-flow-1.2.xsd
new file mode 100644
index 000000000..a70798f2d
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+++ b/org.argeo.slc.spring/src/org/argeo/slc/core/execution/xml/slc-flow-1.2.xsd
@@ -0,0 +1,402 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
+	xmlns:flow="http://www.argeo.org/schema/slc-flow" xmlns:beans="http://www.springframework.org/schema/beans"
+	targetNamespace="http://www.argeo.org/schema/slc-flow"
+	elementFormDefault="qualified" attributeFormDefault="unqualified">
+
+	<xsd:import namespace="http://www.springframework.org/schema/beans"
+		schemaLocation="http://www.springframework.org/schema/beans/spring-beans-2.5.xsd" />
+
+	<xsd:annotation>
+		<xsd:documentation><![CDATA[
+	SLC Flow Schema, version 1.2
+	Authors: Mathieu Baudier
+	
+	This simplifies the definition of SLC flows and their integration with 
+	regular Spring beans.
+		]]></xsd:documentation>
+	</xsd:annotation>
+
+	<xsd:element name="flow">
+		<xsd:annotation>
+			<xsd:documentation><![CDATA[
+	Adds an SLC execution flow, using the default implementation.
+			]]></xsd:documentation>
+		</xsd:annotation>
+		<xsd:complexType>
+			<xsd:complexContent>
+				<xsd:extension base="beans:identifiedType">
+					<xsd:sequence>
+						<xsd:element ref="beans:description" minOccurs="0" />
+						<xsd:sequence>
+							<xsd:element name="arg" minOccurs="0" maxOccurs="unbounded"
+								type="flow:argType">
+								<xsd:annotation>
+									<xsd:documentation><![CDATA[
+	Parameter for an execution flow which will override at instantiation the 
+	value of the parameter already defined as default value or in a parent bean.
+									]]></xsd:documentation>
+								</xsd:annotation>
+							</xsd:element>
+						</xsd:sequence>
+						<xsd:sequence>
+							<xsd:choice minOccurs="0" maxOccurs="unbounded">
+								<xsd:element ref="beans:bean" />
+								<xsd:element ref="beans:ref" />
+								<xsd:element ref="flow:flow" />
+								<xsd:element ref="flow:spec" />
+							</xsd:choice>
+							<!-- <xsd:any namespace="##other" processContents="strict" minOccurs="0" 
+								maxOccurs="unbounded" /> -->
+						</xsd:sequence>
+					</xsd:sequence>
+					<xsd:attribute name="name" type="xsd:string">
+						<xsd:annotation>
+							<xsd:documentation><![CDATA[
+	Name of the flow (alternative to ID).
+							]]></xsd:documentation>
+						</xsd:annotation>
+					</xsd:attribute>
+					<xsd:attribute name="class" type="xsd:string">
+						<xsd:annotation>
+							<xsd:documentation><![CDATA[
+	Another implementation of execution flow.
+							]]></xsd:documentation>
+						</xsd:annotation>
+					</xsd:attribute>
+					<xsd:attribute name="path" type="xsd:string">
+						<!-- DEPRECATED: not used anymore -->
+						<xsd:annotation>
+							<xsd:documentation><![CDATA[
+	The hierarchical path under which to register this flow.
+							]]></xsd:documentation>
+						</xsd:annotation>
+					</xsd:attribute>
+					<xsd:attribute name="spec" type="xsd:string">
+						<xsd:annotation>
+							<xsd:documentation><![CDATA[
+	A reference to the related specification bean.
+							]]></xsd:documentation>
+						</xsd:annotation>
+					</xsd:attribute>
+					<xsd:attribute name="parent" type="xsd:string">
+						<xsd:annotation>
+							<xsd:documentation><![CDATA[
+	The parent bean definition (in Spring sense).
+							]]></xsd:documentation>
+						</xsd:annotation>
+					</xsd:attribute>
+					<xsd:attribute name="abstract" type="xsd:boolean"
+						default="false">
+						<xsd:annotation>
+							<xsd:documentation><![CDATA[
+	Whether this flow is abstract (in Spring sense).
+							]]></xsd:documentation>
+						</xsd:annotation>
+					</xsd:attribute>
+				</xsd:extension>
+			</xsd:complexContent>
+		</xsd:complexType>
+	</xsd:element>
+
+	<xsd:element name="spec">
+		<xsd:annotation>
+			<xsd:documentation><![CDATA[
+	SLC flow specifications, defining the parameters and variables
+	which can be used in related flows, along with their default values and 
+	various constraints.
+			]]></xsd:documentation>
+		</xsd:annotation>
+		<xsd:complexType>
+			<xsd:complexContent>
+				<xsd:extension base="beans:identifiedType">
+					<xsd:sequence>
+						<xsd:element ref="beans:description" minOccurs="0" />
+						<xsd:choice minOccurs="0" maxOccurs="unbounded">
+							<xsd:element name="primitive" type="flow:primitiveSpecAttributeType"
+								minOccurs="0" maxOccurs="unbounded">
+								<xsd:annotation>
+									<xsd:documentation><![CDATA[
+	A primitive specification attribute, that is, a plain standard value
+	and not a reference to an object.
+									]]></xsd:documentation>
+								</xsd:annotation>
+							</xsd:element>
+							<xsd:element name="ref" type="flow:refSpecAttributeType"
+								minOccurs="0" maxOccurs="unbounded">
+								<xsd:annotation>
+									<xsd:documentation><![CDATA[
+	A reference specification attribute, that is, a reference to another object.
+									]]></xsd:documentation>
+								</xsd:annotation>
+							</xsd:element>
+						</xsd:choice>
+					</xsd:sequence>
+				</xsd:extension>
+			</xsd:complexContent>
+		</xsd:complexType>
+	</xsd:element>
+
+	<xsd:complexType name="specAttributeType">
+		<xsd:choice>
+			<xsd:element name="value" minOccurs="0" maxOccurs="1">
+				<xsd:annotation>
+					<xsd:documentation><![CDATA[
+	The default value of the attribute as an inner bean.
+					]]></xsd:documentation>
+				</xsd:annotation>
+				<xsd:complexType>
+					<xsd:choice minOccurs="1" maxOccurs="1">
+						<xsd:element ref="beans:bean" />
+						<xsd:element ref="beans:ref" />
+						<xsd:element ref="beans:list" />
+						<xsd:element ref="beans:set" />
+						<xsd:element ref="beans:map" />
+						<xsd:element ref="beans:props" />
+					</xsd:choice>
+				</xsd:complexType>
+			</xsd:element>
+		</xsd:choice>
+		<xsd:attribute name="name" use="required" type="xsd:string">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	The name of the attribute, under which in can then be referenced.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="value" use="optional" type="xsd:string">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	The default value of the attribute.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="ref" use="optional" type="xsd:string">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	The default value of the attribute as a reference to another bean.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="isImmutable" use="optional" type="xsd:boolean"
+			default="false">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	Whether the attribute is a parameter, that is, it has to be set at 
+	instantiation but can be modified afterwards for objects of scope execution.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="isParameter" use="optional" type="xsd:boolean"
+			default="false">
+			<!-- DEPRECATED: old name of isImmutable -->
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	Whether the attribute is a parameter, that is, it has to be set at 
+	instantiation but can be modified afterwards for objects of scope execution.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="isConstant" use="optional" type="xsd:boolean"
+			default="false">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	Whether the attribute is frozen, that is, it cannot be modified at runtime.
+	A frozen attribute has to be a parameter.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="isFrozen" use="optional" type="xsd:boolean"
+			default="false">
+			<!-- DEPRECATED: old name of isConstant -->
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	Whether the attribute is frozen, that is, it cannot be modified at runtime.
+	A frozen attribute has to be a parameter.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="isHidden" use="optional" type="xsd:boolean"
+			default="false">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	Whether the attribute is hidden, that is, it should not be displayed in UIs.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+	</xsd:complexType>
+
+	<xsd:complexType name="primitiveSpecAttributeType">
+		<xsd:complexContent>
+			<xsd:extension base="flow:specAttributeType">
+				<xsd:attribute name="type" default="string">
+					<xsd:annotation>
+						<xsd:documentation><![CDATA[
+	The type of the primitive specification attribute.
+						]]></xsd:documentation>
+					</xsd:annotation>
+					<xsd:simpleType>
+						<xsd:restriction base="xsd:string">
+							<xsd:enumeration value="string" />
+							<xsd:enumeration value="password" />
+							<xsd:enumeration value="integer" />
+							<xsd:enumeration value="long" />
+							<xsd:enumeration value="float" />
+							<xsd:enumeration value="double" />
+							<xsd:enumeration value="boolean" />
+						</xsd:restriction>
+					</xsd:simpleType>
+				</xsd:attribute>
+			</xsd:extension>
+		</xsd:complexContent>
+	</xsd:complexType>
+
+	<xsd:complexType name="refSpecAttributeType">
+		<xsd:complexContent>
+			<xsd:extension base="flow:specAttributeType">
+				<xsd:choice>
+					<xsd:element name="choices" minOccurs="0" maxOccurs="1">
+						<xsd:annotation>
+							<xsd:documentation><![CDATA[
+	Possible values to chose from, if ommitted, all the beans in the 
+	application context which implement the provided targetClass will 
+	be considered.
+							]]></xsd:documentation>
+						</xsd:annotation>
+						<xsd:complexType>
+							<xsd:choice>
+								<xsd:element name="choice" minOccurs="0" maxOccurs="unbounded"
+									type="flow:refChoiceType">
+									<xsd:annotation>
+										<xsd:documentation><![CDATA[
+	A choice for a reference specification attribute.
+										]]></xsd:documentation>
+									</xsd:annotation>
+								</xsd:element>
+							</xsd:choice>
+						</xsd:complexType>
+					</xsd:element>
+				</xsd:choice>
+				<xsd:attribute name="targetClass" use="required" type="xsd:string">
+					<xsd:annotation>
+						<xsd:documentation><![CDATA[
+	The class that has to be implemented by the underlying object.
+					]]></xsd:documentation>
+					</xsd:annotation>
+				</xsd:attribute>
+			</xsd:extension>
+		</xsd:complexContent>
+	</xsd:complexType>
+
+	<xsd:complexType name="refChoiceType">
+		<xsd:attribute name="name" use="required" type="xsd:string">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	The name of the related bean.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="description" use="optional" type="xsd:string">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	A human readable description of this choice.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+	</xsd:complexType>
+
+	<xsd:complexType name="argType">
+		<xsd:choice minOccurs="0" maxOccurs="1">
+			<xsd:element ref="beans:bean" />
+			<xsd:element ref="beans:ref" />
+			<xsd:element ref="flow:param" />
+			<xsd:element ref="beans:list" />
+			<xsd:element ref="beans:set" />
+			<xsd:element ref="beans:map" />
+			<xsd:element ref="beans:props" />
+		</xsd:choice>
+		<xsd:attribute name="name" use="required" type="xsd:string">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	The name of the related parameter.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="value" type="xsd:string">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	The plain value of the related parameter.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+		<xsd:attribute name="ref" type="xsd:string">
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	The value of the related parameter as a reference to a bean.
+				]]></xsd:documentation>
+			</xsd:annotation>
+		</xsd:attribute>
+	</xsd:complexType>
+
+	<xsd:attribute name="as-flow" type="xsd:string">
+		<xsd:annotation>
+			<xsd:documentation><![CDATA[
+	If decorating an executable bean, it will generate an implicit SLC 
+	execution flow with the provided value as name.
+			]]></xsd:documentation>
+		</xsd:annotation>
+	</xsd:attribute>
+	<!-- <xsd:attribute name="var" type="xsd:boolean"> <xsd:annotation> <xsd:documentation><![CDATA[ 
+		If true, the decorated bean is set to scope execution and proxied. ]]></xsd:documentation> 
+		</xsd:annotation> </xsd:attribute> -->
+
+	<xsd:element name="variable">
+		<xsd:complexType>
+			<xsd:annotation>
+				<xsd:documentation><![CDATA[
+	Marks a bean definition as being variable, i.e. a scoped proxy of scope execution 
+			]]></xsd:documentation>
+			</xsd:annotation>
+			<xsd:attribute name="proxy-target-class" type="xsd:boolean"
+				default="true">
+				<xsd:annotation>
+					<xsd:documentation><![CDATA[
+						Are class-based (CGLIB) proxies to be created?
+						This is the default;
+						in order to switch to standard Java
+						interface-based proxies, turn this flag to
+						"false".
+					]]></xsd:documentation>
+				</xsd:annotation>
+			</xsd:attribute>
+		</xsd:complexType>
+	</xsd:element>
+
+	<xsd:element name="param">
+		<xsd:annotation>
+			<xsd:documentation><![CDATA[
+	If within a property tag of a bean, it will set the value of this property
+	 with a reference to a parameter.
+			]]></xsd:documentation>
+		</xsd:annotation>
+		<xsd:complexType>
+			<xsd:attribute name="name" type="xsd:string" use="required">
+				<xsd:annotation>
+					<xsd:documentation><![CDATA[
+	The name of the related parameter.
+					]]></xsd:documentation>
+				</xsd:annotation>
+			</xsd:attribute>
+			<xsd:attribute name="instantiationManager" type="xsd:string"
+				use="optional" default="instantiationManager">
+				<xsd:annotation>
+					<xsd:documentation><![CDATA[
+	A reference to the instantiation manager to use instead of the default one
+	(expert usage).
+					]]></xsd:documentation>
+				</xsd:annotation>
+			</xsd:attribute>
+		</xsd:complexType>
+	</xsd:element>
+
+</xsd:schema>
\ No newline at end of file