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Commit 34277487 authored by Jérome Perrin's avatar Jérome Perrin
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fix structured text format for HelpSys 



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product/ERP5Type/help/001-overview.stx
View file @ 34277487
ERP5 is based on a Rapid Application Developpment (RAD) Overview
framework: **ERP5Type**. ERP5Type allows to reduce by 50% or more
the number of lines of code needed to develop a Zope / CMF application. ERP5 is based on a Rapid Application Developpment (RAD) framework:
It provides an efficient way to create complex forms. It implements **ERP5Type**. ERP5Type allows to reduce by 50% or more the number of lines of
categories and relations. It also includes a flexible and fast code needed to develop a Zope / CMF application. It provides an efficient
cataloging mechanism for ERP documents based on simple SQL queries. way to create complex forms. It implements categories and relations. It also
**With ERP5Type, the Zope object database can be queried using includes a flexible and fast cataloging mechanism for ERP documents based on
simple or complex SQL queries and implements relations.** simple SQL queries.
In this chapter, we shall introduce the ERP5 RAD. **With ERP5Type, the Zope object database can be queried using simple or
complex SQL queries and implements relations.**
In this chapter, we shall introduce the ERP5 RAD.
ERP5Type: professional ERP applications in a matter of minutes ERP5Type: professional ERP applications in a matter of minutes
......
product/ERP5Type/help/PropertySheets.stx
View file @ 34277487
ERP systems involve many different attribute names which PropertySheets
can be used in different contexts. For example, a resource
may have a default global price. A path may define a default price ERP systems involve many different attribute names which
for specific source. can be used in different contexts. For example, a resource
may have a default global price. A path may define a default price
ERP5 uses PropertySheets in order to provide an explicit data model for specific source.
which is used independently from interfaces. The role of interfaces
is to define common explicit behaviour which can be implemented through ERP5 uses PropertySheets in order to provide an explicit data model
by different classes. The role of property sheets is which is used independently from interfaces. The role of interfaces
to define common **attribute sets** which can be stored on instances is to define common explicit behaviour which can be implemented through
of different documents. by different classes. The role of property sheets is
to define common **attribute sets** which can be stored on instances
PropertySheets also hold explicit information about of the ERP data structure. of different documents.
For example, some documents may not hold themselves pricing information
but rather acquire it through the order or the sourcing contract they depend from. PropertySheets also hold explicit information about of the ERP data structure.
For example, some documents may not hold themselves pricing information
ERP5 implements this feature through **explicit acquisition**. The value but rather acquire it through the order or the sourcing contract they depend from.
of attributes can be obtained by looking up the value of that attribute
on another related document or by calling a method on another related document. ERP5 implements this feature through **explicit acquisition**. The value
of attributes can be obtained by looking up the value of that attribute
Explicit acquisition requires to define relations between documents. The general on another related document or by calling a method on another related document.
model adopted by ERP5 is a **categorization** model which is equivalent to
a DACG model (Direct Acyclic Colored Graph). Thanks to Zope acquisition, this model Explicit acquisition requires to define relations between documents. The general
is theoretically equivalent to a relationnal model. model adopted by ERP5 is a **categorization** model which is equivalent to
a DACG model (Direct Acyclic Colored Graph). Thanks to Zope acquisition, this model
We will explain bellow how those three concepts (attribute sets, categorization and is theoretically equivalent to a relationnal model.
explicit acquisition) relate and how to define new Property Sheets in ERP5.
We will explain bellow how those three concepts (attribute sets, categorization and
Attribute Sets explicit acquisition) relate and how to define new Property Sheets in ERP5.
ERP5 uses Attribute Sets based on an approach which was originally developped Attribute Sets
by Max M. for its Zope Easy Product (http://www.zope.org/Members/maxm/HowTo/easyProduct).
This approach consists in defining a set of attributes in the following way:: ERP5 uses Attribute Sets based on an approach which was originally developped
by Max M. for its Zope Easy Product (http://www.zope.org/Members/maxm/HowTo/easyProduct).
class Organisation: This approach consists in defining a set of attributes in the following way::
"""
Organisation properties and categories class Organisation:
""" """
Organisation properties and categories
_properties = ( """
{ 'id' : 'corporate_name',
'description' : 'The official name of this organisation', _properties = (
'type' : 'string', { 'id' : 'corporate_name',
'mode' : 'w' }, 'description' : 'The official name of this organisation',
{ 'id' : 'social_capital', 'type' : 'string',
'description' : 'The social capital of this organisation', 'mode' : 'w' },
'type' : 'int', { 'id' : 'social_capital',
'mode' : 'w' }, 'description' : 'The social capital of this organisation',
{ 'id' : 'social_capital_currency', 'type' : 'int',
'description' : "The currency in which the social capital is" 'mode' : 'w' },
"expressed", { 'id' : 'social_capital_currency',
'type' : 'string', 'description' : "The currency in which the social capital is"
'mode' : 'w' }, "expressed",
) 'type' : 'string',
'mode' : 'w' },
The class *Organisation* is simply a place holder for an class attribute )
called *_properties* which holds a list of dictionnaries, each of which
describes the *id*, the *purpose* and the *type* of an attribute. In the The class *Organisation* is simply a place holder for an class attribute
above example, the attribute *corporate_name* is of type *string*, is called *_properties* which holds a list of dictionnaries, each of which
in *write mode* which means it can be read and modified and is described describes the *id*, the *purpose* and the *type* of an attribute. In the
as *The official name of this organisation*. above example, the attribute *corporate_name* is of type *string*, is
in *write mode* which means it can be read and modified and is described
Attribute sets allow to group related attributes in a common *package* as *The official name of this organisation*.
and reuse them to define ERP5 classes. For example, the *Organisation* class
in ERP5 is defined as:: Attribute sets allow to group related attributes in a common *package*
and reuse them to define ERP5 classes. For example, the *Organisation* class
class Organisation(Entity, MetaNode, XMLObject): in ERP5 is defined as::
class Organisation(Entity, MetaNode, XMLObject):
"""
An Organisation object holds the information about
an organisation (ex. a division in a company, a company,
a service in a public administration).
Organisation objects can contain Coordinate objects
(ex. Telephone, Url) as well a documents of various types.
Organisation objects can be synchronized accross multiple
sites.
Organisation objects inherit from the MetaNode base class
(one of the 5 base classes in the ERP5 universal business model)
"""
meta_type = 'ERP5 Organisation'
portal_type = 'Organisation'
isPortalContent = 1
isRADContent = 1
# Declarative security
security = ClassSecurityInfo()
security.declareObjectProtected(ERP5Permissions.AccessContentsInformation)
# Declarative properties
property_sheets = ( PropertySheet.Base
, PropertySheet.XMLObject
, PropertySheet.CategoryCore
, PropertySheet.DublinCore
, PropertySheet.Organisation
)
# Factory Type Information
factory_type_information = \
{ 'id' : portal_type
, 'meta_type' : meta_type
, 'description' : """\
An Organisation object holds the information about
an organisation (ex. a division in a company, a company,
a service in a public administration)."""
, 'icon' : 'organisation_icon.gif'
, 'product' : 'ERP5'
, 'factory' : 'addOrganisation'
, 'immediate_view' : 'organisation_edit'
, 'actions' :
( { 'id' : 'view'
, 'name' : 'View'
, 'category' : 'object_view'
, 'action' : 'organisation_edit'
, 'permissions' : (
ERP5Permissions.View, )
}
, { 'id' : 'print'
, 'name' : 'Print'
, 'category' : 'object_print'
, 'action' : 'organisation_print'
, 'permissions' : (
ERP5Permissions.View, )
}
, { 'id' : 'metadata'
, 'name' : 'Metadata'
, 'category' : 'object_edit'
, 'action' : 'metadata_edit'
, 'permissions' : (
ERP5Permissions.View, )
}
, { 'id' : 'translate'
, 'name' : 'Translate'
, 'category' : 'object_action'
, 'action' : 'translation_template_view'
, 'permissions' : (
ERP5Permissions.TranslateContent, )
}
)
}
InitializeClass(Organisation)
The reader should take notice of two ERP5 specific features in the
class definition:
- the attribute *isRADContent* is set to 1, which is used by ERP5
to determine that a given class definition should be considered
as an **ERP5 RAD Class** or not. The meaning of *RAD* is *Rapid
Application Development*. Classes which set the
the attribute *isRADContent* to 1 will automatically benefit from
ERP5 RAD features (ex. automatic generation of accessors, automatic
generation of default values, etc.)
- the attribute *property_sheets* contains a list of PropertySheets. This
list defines the default attributes for all instances of the *Organisation*
class
During the initialization of an **ERP5 RAD Class**, the following
class attributes and methods will be automatically generated:
- a class attribute holding a **default value**. In
the example of the *Organisation* class, a class attribute
named *corporate_name* is created and set to
the default string ('').
- a default **getter** accessor method if no such accessor
is already defined by the class. In
the example of the *Organisation* class, a method
named *getCorporateName* is created, which returns
the value of the *corporate_name* instance attribute.
- a default **setter** accessor method if no such accessor
is already defined by the class. In
the example of the *Organisation* class, a method
named *setCorporateName* is created, which changes
the value of the *corporate_name* document attribute
and reindexes the document. Another method
named *_setCorporateName* is created to change
the value of the *corporate_name* document attribute
without reindexing it.
Besides *getters* and *setters*, all ERP5 documents
which are implemented by an **ERP5 RAD Class** can
be modified with the **edit** method. For example::
document.edit(corporate_name='ACME')
is equivalent to::
document.setCorporateName('ACME')
The use of *edit* allows to reindex documents only once.
For example::
document.edit(corporate_name='ACME',social_capital=30000)
is equivalent to::
document._setCorporateName('ACME')
document.setSocialCapital(30000)
Default attribute values and types are defined in the Utils.py
file at the root of the ERP5 Product::
defaults = {
'float' : 0.0,
'int' : 0,
'long' : 0L,
'date' : DateTime(),
'string' : '',
'text' : '',
'boolean' : 0,
'lines' : [],
'tokens' : [],
'selection' : [],
'multiple selection' : [],
}
**The use of getters and setters in ERP5 is not only recommended
but is considered as COMPULSORY** since they provide a functional
approach to content access and allow a more consistent implementation
of complex interactions between documents. **NEVER ACCESS DIRECTLY
A DOCUMENT ATTRIBUTE IN ERP5 OUTSIDE A PRIVATE METHOD.
ONLY USE GETTERS AND SETTERS**
*Implementation*: functions createDefaultAccessors and
Categories
First of all, a certain number
of base categories is defined. Such categories can are identified by a string such
as: region, client, skill, function, etc. Each category can hold subcategories,
sub-subcategories, etc. For example, regions allow to categorize geography in EPR5::
region/americas
region/americas/central
region/americas/north
region/americas/south
region/americas/south/brazil
region/europe
region/europe/central
region/europe/central/poland
region/europe/east
region/europe/north
region/europe/west
region/europe/west/france
region/europe/west/netherlands
(we only included the countries where people contribute to ERP5 currently - if you
contribute to ERP5 and your country is not list, let us know)
Each ERP5 document holds a *categories* attribute which contains a tuple
of category paths storever as a tuple of lines. Categories are considered
as a *slowly evolving* in an ERP5 system.
Documents which are implemented as **ERP5 RAD Class** can also benefit
from the automatic creation of accessors in the area of categories. For example,
the *Organisation* property sheet includes references to some default
base categories of ERP5::
class Organisation:
"""
Organisation properties and categories
"""
_properties = (
{ 'id' : 'corporate_name',
'description' : 'The official name of this organisation',
'type' : 'string',
'mode' : 'w' },
{ 'id' : 'social_capital',
'description' : 'The social capital of this organisation',
'type' : 'int',
'mode' : 'w' },
{ 'id' : 'social_capital_currency',
'description' : "The currency in which the social capital is"
"expressed",
'type' : 'string',
'mode' : 'w' },
)
_categories = ( 'role', 'group', 'activity', 'skill', 'market_segment',
'social_form', 'function' )
The *_categories* attributes holds a tuple of strings which defines
which ids of base categories should be implemented by documents of
type Organisation. Based on this definition, the following getter and
setter methods are defined::
getRole getDefaultRole setRole _setRole
getGroup getDefaultGroup setGroup _setGroup
getActivity getDefaultActivity setActivity _setActivity
getSkill getDefaultSkill setSkill _setSkill
getMarketSegment getDefaultMarketSegment setMarketSegment _setMarketSegment
getSocialForm getDefaultSocialForm setSocialForm _setSocialForm
getFunction getDefaultFunction setFunction _setFunction
Each of these getters and setters sets or returns a list of partial path values except
for the *Default* category getter which returns the first value in of the base
category membership of a document.
Ordered Categories
Categories are ordered.
*Implementation*: all this is implemented by createCategoryAccessors
in Utils.py
Categories and relations
Categories allow to implement document categorization but also relations.
In ERP5, categories are managed by a portal tool names **portal_categories**.
Because ERP5 is based on Zope and because provides implicit acquisition,
if an EPR5 document has for example the following path::
/portal_root/organisation/3
Then, this object can also be accessed as::
/portal_root/portal_categories/client/organisation/3
This allows to define virtual categories in a base category
without having to create many subcategories. For example,
the category::
client/organisation/3
only exists through acquisition. Including in the list of category paths
of a document a paths such as::
client/organisation/3
is equivalent to creating an **arc** of coulor *client* between
that document and the document
/portal_root/organisation/3
Since relaltional models are equivalent to graphs, we can see
here that the ERP5 categorization model provides the same expressive
power as a relational model. Base categories are the equivalent
to a relation identifier. Arcs are created between a document
and a virtual subcategory acquired through implicit acquisition.
**All relations are therefore treated in ERP5 as categories**
Explicit Relational Acquisition
One of the purpose of property sheets is to create
a complete documentation of all attributes which can be used
in a complexe ERP5 system, and to make sure that no name conflict
happens. We want the *getTitle* or the *getPrice* accessor to mean the same thing
wherever it is used from.
In some cases, some attribute values can be *acquired* by one
document from another document. In the Zope environment,
acquisition allows to get the value of an attribute of one
document from the value of its parents. However, in ERP5,
we have multiple hierarchies. We may want to get the telephone
of a person based on the office he/she is working (which is a region
based tree) while we want to get the name of his product line
through the division he/she belongs to (this is a product line tree).
Explicit Relational Acquisition provides a simple way to implement
this feature. Let us look at the example bellow::
class SalesOpportunity:
""" """
An Organisation object holds the information about Sales Opportunity properties and categories
an organisation (ex. a division in a company, a company,
a service in a public administration).
Organisation objects can contain Coordinate objects
(ex. Telephone, Url) as well a documents of various types.
Organisation objects can be synchronized accross multiple
sites.
Organisation objects inherit from the MetaNode base class
(one of the 5 base classes in the ERP5 universal business model)
""" """
meta_type = 'ERP5 Organisation' _properties = (
portal_type = 'Organisation' { 'id' : 'client_organisation',
isPortalContent = 1 'description' : 'The organisation involved',
isRADContent = 1 'type' : 'string',
'acquisition' : {
# Declarative security 'base_category' : ('client',),
security = ClassSecurityInfo() 'portal_type' : ('Organisation',),
security.declareObjectProtected(ERP5Permissions.AccessContentsInformation) 'copy_value' : 0,
'accessor_id' : 'getTitle',
# Declarative properties 'depends' : None
property_sheets = ( PropertySheet.Base },
, PropertySheet.XMLObject 'mode' : 'w' },
, PropertySheet.CategoryCore { 'id' : 'client_person',
, PropertySheet.DublinCore 'description' : "The contact person involved",
, PropertySheet.Organisation 'type' : 'string',
) 'acquisition' : {
'base_category' : ('client',),
# Factory Type Information 'portal_type' : ('Person',),
factory_type_information = \ 'copy_value' : 0,
{ 'id' : portal_type 'accessor_id' : 'getTitle',
, 'meta_type' : meta_type 'depends' : None
, 'description' : """\ },
An Organisation object holds the information about 'mode' : 'w' },
an organisation (ex. a division in a company, a company, )
a service in a public administration)."""
, 'icon' : 'organisation_icon.gif' _categories = ('role', 'group', 'activity', 'function',
, 'product' : 'ERP5' 'social_form', 'skill', 'market_segment')
, 'factory' : 'addOrganisation'
, 'immediate_view' : 'organisation_edit'
, 'actions' : The name of the client_person is acquired by look at documents
( { 'id' : 'view' of type *Person* in the *client* tree (or relation) and applying
, 'name' : 'View' the getTitle method. The attribute can be calculated each time
, 'category' : 'object_view' (copy_value is 0) or copied once for all (copy_value is 0).
, 'action' : 'organisation_edit'
, 'permissions' : ( Accessors:
ERP5Permissions.View, )
} _getReference
, { 'id' : 'print' _getReferencePath
, 'name' : 'Print' _getReferenceList
, 'category' : 'object_print'
, 'action' : 'organisation_print'
, 'permissions' : ( FAQ
ERP5Permissions.View, )
} Do I need to create an attribute for a category ?
, { 'id' : 'metadata'
, 'name' : 'Metadata' It depends : if some information can be in a different application,
, 'category' : 'object_edit' you need to holde the information somewhere, ....
, 'action' : 'metadata_edit'
, 'permissions' : ( Possible scenario
ERP5Permissions.View, )
} copy_value
, { 'id' : 'translate' mask_value
, 'name' : 'Translate' sync_value
, 'category' : 'object_action'
, 'action' : 'translation_template_view'
, 'permissions' : ( Future
ERP5Permissions.TranslateContent, )
} Atribute lookup should be put outside property sheet
) into a tool ?
}
InitializeClass(Organisation)
The reader should take notice of two ERP5 specific features in the
class definition:
- the attribute *isRADContent* is set to 1, which is used by ERP5
to determine that a given class definition should be considered
as an **ERP5 RAD Class** or not. The meaning of *RAD* is *Rapid
Application Development*. Classes which set the
the attribute *isRADContent* to 1 will automatically benefit from
ERP5 RAD features (ex. automatic generation of accessors, automatic
generation of default values, etc.)
- the attribute *property_sheets* contains a list of PropertySheets. This
list defines the default attributes for all instances of the *Organisation*
class
During the initialization of an **ERP5 RAD Class**, the following
class attributes and methods will be automatically generated:
- a class attribute holding a **default value**. In
the example of the *Organisation* class, a class attribute
named *corporate_name* is created and set to
the default string ('').
- a default **getter** accessor method if no such accessor
is already defined by the class. In
the example of the *Organisation* class, a method
named *getCorporateName* is created, which returns
the value of the *corporate_name* instance attribute.
- a default **setter** accessor method if no such accessor
is already defined by the class. In
the example of the *Organisation* class, a method
named *setCorporateName* is created, which changes
the value of the *corporate_name* document attribute
and reindexes the document. Another method
named *_setCorporateName* is created to change
the value of the *corporate_name* document attribute
without reindexing it.
Besides *getters* and *setters*, all ERP5 documents
which are implemented by an **ERP5 RAD Class** can
be modified with the **edit** method. For example::
document.edit(corporate_name='ACME')
is equivalent to::
document.setCorporateName('ACME')
The use of *edit* allows to reindex documents only once.
For example::
document.edit(corporate_name='ACME',social_capital=30000)
is equivalent to::
document._setCorporateName('ACME')
document.setSocialCapital(30000)
Default attribute values and types are defined in the Utils.py
file at the root of the ERP5 Product::
defaults = {
'float' : 0.0,
'int' : 0,
'long' : 0L,
'date' : DateTime(),
'string' : '',
'text' : '',
'boolean' : 0,
'lines' : [],
'tokens' : [],
'selection' : [],
'multiple selection' : [],
}
**The use of getters and setters in ERP5 is not only recommended
but is considered as COMPULSORY** since they provide a functional
approach to content access and allow a more consistent implementation
of complex interactions between documents. **NEVER ACCESS DIRECTLY
A DOCUMENT ATTRIBUTE IN ERP5 OUTSIDE A PRIVATE METHOD.
ONLY USE GETTERS AND SETTERS**
*Implementation*: functions createDefaultAccessors and
Categories
First of all, a certain number
of base categories is defined. Such categories can are identified by a string such
as: region, client, skill, function, etc. Each category can hold subcategories,
sub-subcategories, etc. For example, regions allow to categorize geography in EPR5::
region/americas
region/americas/central
region/americas/north
region/americas/south
region/americas/south/brazil
region/europe
region/europe/central
region/europe/central/poland
region/europe/east
region/europe/north
region/europe/west
region/europe/west/france
region/europe/west/netherlands
(we only included the countries where people contribute to ERP5 currently - if you
contribute to ERP5 and your country is not list, let us know)
Each ERP5 document holds a *categories* attribute which contains a tuple
of category paths storever as a tuple of lines. Categories are considered
as a *slowly evolving* in an ERP5 system.
Documents which are implemented as **ERP5 RAD Class** can also benefit
from the automatic creation of accessors in the area of categories. For example,
the *Organisation* property sheet includes references to some default
base categories of ERP5::
class Organisation:
"""
Organisation properties and categories
"""
_properties = (
{ 'id' : 'corporate_name',
'description' : 'The official name of this organisation',
'type' : 'string',
'mode' : 'w' },
{ 'id' : 'social_capital',
'description' : 'The social capital of this organisation',
'type' : 'int',
'mode' : 'w' },
{ 'id' : 'social_capital_currency',
'description' : "The currency in which the social capital is"
"expressed",
'type' : 'string',
'mode' : 'w' },
)
_categories = ( 'role', 'group', 'activity', 'skill', 'market_segment',
'social_form', 'function' )
The *_categories* attributes holds a tuple of strings which defines
which ids of base categories should be implemented by documents of
type Organisation. Based on this definition, the following getter and
setter methods are defined::
getRole getDefaultRole setRole _setRole
getGroup getDefaultGroup setGroup _setGroup
getActivity getDefaultActivity setActivity _setActivity
getSkill getDefaultSkill setSkill _setSkill
getMarketSegment getDefaultMarketSegment setMarketSegment _setMarketSegment
getSocialForm getDefaultSocialForm setSocialForm _setSocialForm
getFunction getDefaultFunction setFunction _setFunction
Each of these getters and setters sets or returns a list of partial path values except
for the *Default* category getter which returns the first value in of the base
category membership of a document.
Ordered Categories
Categories are ordered.
*Implementation*: all this is implemented by createCategoryAccessors
in Utils.py
Categories and relations
Categories allow to implement document categorization but also relations.
In ERP5, categories are managed by a portal tool names **portal_categories**.
Because ERP5 is based on Zope and because provides implicit acquisition,
if an EPR5 document has for example the following path::
/portal_root/organisation/3
Then, this object can also be accessed as::
/portal_root/portal_categories/client/organisation/3
This allows to define virtual categories in a base category
without having to create many subcategories. For example,
the category::
client/organisation/3
only exists through acquisition. Including in the list of category paths
of a document a paths such as::
client/organisation/3
is equivalent to creating an **arc** of coulor *client* between
that document and the document
/portal_root/organisation/3
Since relaltional models are equivalent to graphs, we can see
here that the ERP5 categorization model provides the same expressive
power as a relational model. Base categories are the equivalent
to a relation identifier. Arcs are created between a document
and a virtual subcategory acquired through implicit acquisition.
**All relations are therefore treated in ERP5 as categories**
Explicit Relational Acquisition
One of the purpose of property sheets is to create
a complete documentation of all attributes which can be used
in a complexe ERP5 system, and to make sure that no name conflict
happens. We want the *getTitle* or the *getPrice* accessor to mean the same thing
wherever it is used from.
In some cases, some attribute values can be *acquired* by one
document from another document. In the Zope environment,
acquisition allows to get the value of an attribute of one
document from the value of its parents. However, in ERP5,
we have multiple hierarchies. We may want to get the telephone
of a person based on the office he/she is working (which is a region
based tree) while we want to get the name of his product line
through the division he/she belongs to (this is a product line tree).
Explicit Relational Acquisition provides a simple way to implement
this feature. Let us look at the example bellow::
class SalesOpportunity:
"""
Sales Opportunity properties and categories
"""
_properties = (
{ 'id' : 'client_organisation',
'description' : 'The organisation involved',
'type' : 'string',
'acquisition' : {
'base_category' : ('client',),
'portal_type' : ('Organisation',),
'copy_value' : 0,
'accessor_id' : 'getTitle',
'depends' : None
},
'mode' : 'w' },
{ 'id' : 'client_person',
'description' : "The contact person involved",
'type' : 'string',
'acquisition' : {
'base_category' : ('client',),
'portal_type' : ('Person',),
'copy_value' : 0,
'accessor_id' : 'getTitle',
'depends' : None
},
'mode' : 'w' },
)
_categories = ('role', 'group', 'activity', 'function',
'social_form', 'skill', 'market_segment')
The name of the client_person is acquired by look at documents
of type *Person* in the *client* tree (or relation) and applying
the getTitle method. The attribute can be calculated each time
(copy_value is 0) or copied once for all (copy_value is 0).
Accessors:
_getReference
_getReferencePath
_getReferenceList
FAQ
Do I need to create an attribute for a category ?
It depends : if some information can be in a different application,
you need to holde the information somewhere, ....
Possible scenario
copy_value
mask_value
sync_value
Future
Atribute lookup should be put outside property sheet
into a tool ?
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