Subsequent calls describe the contents of the layer until a matching call to XLayerHandler::endLayer() is encountered.

Must match a previous call to XLayerHandler::startLayer().

• if invalid data is detected in the layer
• if there is a unfinished subnode in progress
• if no layer is started at all
• if the layer tries to override read-only or final data

Not every implementation can detect each condition

Subsequent calls describe overrides to properties and members or items of the node until a matching call to XLayerHandler::endNode()is encountered.

The value is a combination of NodeAttribute flags.

The attributes are combined cumulatively with those set on lower layers.

• if there isn't a layer in progress
• if there already was a change to that node
• if there is no node with that name
• if the node is marked read-only in a lower layer
• if the name is not a valid node name
• if the attributes are not valid for the node

Not every implementation can detect each condition

The current node must be a set and a preexisting item (if any) must be removeable.

The new item will be created from the default template of the set.

Subsequent calls describe the difference from the template of properties and members or items of the node until a matching call to XLayerHandler::endNode() is encountered.

The value is a combination of NodeAttribute flags. Note that NodeAttribute::FUSE has an impact on the semantics of this method.

• if there isn't a set node in progress currently
• if there already was a change to a node of that name
• if the template for the new node is not found
• if an item of that name on a lower layer is not removeable
• if the name is not a valid item name
• if the attributes are not valid for the node

Not every implementation can detect each condition

The current node must be a set and a preexisting item (if any) must be removeable.

Subsequent calls describe the difference from the template of properties and members or items of the node until a matching call to XLayerHandler::endNode() is encountered.

The value is a combination of NodeAttribute flags. Note that NodeAttribute::FUSE has an impact on the semantics of this method.

• if there isn't a set node in progress currently
• if there already was a change to a node of that name
• if the template for the new node is not found
• if the template is not a valid item type for the containing set
• if an item of that name on a lower layer is not removeable
• if the name is not a valid item name
• if the attributes are not valid for the node

Not every implementation can detect each condition

Must match the last open call to XLayerHandler::overrideNode(), XLayerHandler::addOrReplaceNode() or XLayerHandler::addOrReplaceNodeFromTemplate().

• if invalid data is detected in the node
• if no node is started at all

Not every implementation can detect each condition

The current node must be a set and the item must be removeable.

• if there isn't a set node in progress currently
• if there already was a change to a node of that name
• if there is no item with that name
• if the item is not removeable
• if the name is not a valid node name

Not every implementation can detect each condition

Subsequent calls describe new value(s) for the property until a matching call to XLayerHandler::endProperty() is encountered.

The value is a combination of NodeAttribute flags.

The attributes are combined cumulatively with those set on lower layers.

This must be the same type as is already defined in the schema or lower layers, unless the previous type was unspecified (as indicated by TypeClass::ANY.)

A void type indicates that the type is unspecified in this layer. In this case any subsequent value may be of a generic type (e.g. string or - for list values - string[].) Such values may be converted to the type defined in the schema by the implementation.

• if there isn't a group or extensible node in progress currently
• if there already was a change to a property of that name
• if there is no property with that name
• if the property is read-only
• if the type does not match the type of the property
• if a type is missing and cannot be determined otherwise
• if the name is not a valid property name
• if the attributes are not valid for the property

Not every implementation can detect each condition

The value must match the type of the current property. If the property does not have the SchemaAttribute::REQUIRED flag set, the value can be void.

If the current property is localized, this value applies to the default locale.

• if there isn't a property in progress currently
• if there already was a change to the value of that property
• if the value does not have the proper type
• if the value is not valid for the property

Not every implementation can detect each condition

The value must match the type of the current property. If the property does not have the SchemaAttribute::REQUIRED flag set, the value can be void.

• if there isn't a property in progress currently
• if the current property isn't localized
• if there already was a change to the property for that locale
• if the value does not have the proper type
• if the value is not valid for the property
• if the locale is not a valid locale

Not every implementation can detect each condition

Must match an open call to XLayerHandler::overrideProperty(),

• if invalid data is detected in the property
• if no property is started at all

Not every implementation can detect each condition

The current node must be extensible.

The value is a combination of NodeAttribute flags and may also contain the SchemaAttribute::REQUIRED flag.

NodeAttribute::MANDATORY need not be set, as dynamically added properties always are mandatory in subsequent layers.

• if there isn't an extensible node in progress currently
• if a property with that name already exists
• if the specified type is not allowed for a property
• if the name is not a valid property name
• if the attributes are not valid for the property

Not every implementation can detect each condition

The current node must be extensible.

The value is a combination of NodeAttribute flags and may also contain the SchemaAttribute::REQUIRED flag.

NodeAttribute::MANDATORY need not be set, as dynamic properties always are mandatory in subsequent layers.

The value also determines the type. Therefore the value must not be void.

• if there isn't an extensible node in progress currently
• if a property with that name already exists
• if the type of the value is not an allowed type or if the value is void
• if the name is not a valid property name
• if the value is not valid for the property
• if the attributes are not valid for the property

Not every implementation can detect each condition