PLMXML Delta Schema This element represents adding a fragment of PLMXML, i.e. a tree of elements, to a master document. The sub-elements of this element are all added. Attributes: parentRef: A URI reference to a placeholder element which represents the element in the master document which will become the parent of the added elements. Exactly one of parentRef or siblingRef should be present. siblingRef: A URI reference to a placeholder element which represents the element in the master document which will become a sibling of the added elements. There is no implication that the added element will be adjacent to the sibling element in the sub-element ordering - only that it will have the same parent. Elements: Any PLMXML elements may be included as sub-elements. This element represents replacing a fragment of PLMXML, i.e. a tree of elements, with another tree. The sub-element of this element is used to replace the target element and all its descendents. Attributes: targetRef: A URI reference to a placeholder element which represents the element in the master document which will be replaced. Elements: Any PLMXML element may be included as sub-element. There must be exactly one. This element represents deleting a fragment of PLMXML, i.e. a tree of elements, from a master document. NOTE that it also removes any IDREF or local URI references to those elements, since normally you would not want 'dangling' references left. For example, deleting an Instance will automatically remove that Instance from any 'instanceRefs' attributes which reference it. Attributes: targetRefs: A multiple URI reference to placeholder element(s) which represent the elements in the master document which will be deleted, along with their sub-elements. This element represents modifying an element in a master document in some way, depending on the 'op' attribute. Attributes: targetRef: A URI reference to a placeholder element which represents the element in the master document which will be modified. attributeName: The name of the attribute being modified, if any. values: The value or values to be used when modifying the attribute. The way in which this is used to make the modification is determined by the 'op' attribute. valueRefs: URI reference to placeholder element(s) which represent elements in the master document; or to elements in Add or Replace blocks in this delta. The attribute being modified is altered to reference these elements, according to the value of the 'op' attribute. op: This determines the operation used to make the modification. One of 'replace' completely replaces an existing attribute value, with the value in 'values' or 'valueRefs'. 'add' adds the values in 'values' or 'valueRefs' to an existing attribute, for example an integer array, IDREFS or multiple URI attribute. 'remove' removes the values in 'values' or 'valueRefs' from an existing attribute. 'delete' deletes an existing attribute entirely. 'modifyUserData' merges the UserData of this Modify element into the UserData of the target element. 'attributeName' is not set in this case. This element is a reference to an object in an Application data model. At present it identifies the object by containing one or more ApplicationRef sub-elements. Attributes: type: Optional PLMXML type of the external object, e.g. "ProductRevision" The top-level element in a PLMXML Delta file. This represents a delta, or change, to be applied to a PLMXML file or equivalent Application model (the 'master' file/model). Attributes: context: A URI or other indication of the master Document or model to which this delta is to be applied. SubElements: Add: Add elements, representing the addition of a tree of elements Replace: Replace elements, representing the replacement of a tree of elements Delete: Delete elements, representing the deletion of trees of elements Modify: Modify elements, representing an alteration to an attribute of an element. ExternalReference: References to Application objects.