Common Attribute Types

An attribute type serves as a constraint on the value of a plan or component attribute. If an attribute does not list a specific type, its value is unconstrained.

The following sections describe the format of the attribute types that are used by the schema. \p{N} represents all Unicode numbers, while \p{L} represents all Unicode letters.

entityName Attribute Type

Attributes of type entityName have a maximum length of 512 characters and match the following pattern:

[\p{N}\p{L}-_. ]+

As a special case, dot (.) and dot-dot (..) are not permitted to be entity names.

systemName Attribute Type

Attributes of type systemName consist of a simpleSystemName that has a maximum length of 64 characters, and optionally, a pluginName that also has a maximum length of 64 characters, as follows:

simpleSystemName
pluginName#
simpleSystemName

where simpleSystemName matches the following pattern:

[\p{L}_][\p{N}\p{L}-_. +]*

identifier Attribute Type

Attributes of type identifier have a maximum length of 32 characters and match the following pattern:

[\p{L}_][\p{N}\p{L}_]*

pathName Attribute Type

Attributes of type pathName have a maximum length of 512 characters and match one of the following patterns:

"/"
( "/" pathPart )+

where pathPart is [\p{N}\p{L}-_. ]+.

As a special case, dot (.) and dot-dot (..) are not permitted to be included in pathPart.

pathReference Attribute Type

Attributes of type pathReference have the following syntax:

pathReference:
    absolutePath
    relativePath

absolutePath:
    "/"
    "/" relativePath

relativePath:
    relativePathStart
    relativePathStart "/" relativePath

relativePathStart:
    "."
    ".."
    identifier

modifierEnum Attribute Type

Attributes of type modifierEnum have either ABSTRACT or FINAL as their value. In general, a value of ABSTRACT indicates that the associated entity must be overridden by a derived component. A value of FINAL indicates that the associated entity cannot be overridden.

accessEnum Attribute Type

Attributes of type accessEnum have one of these values:

• PUBLIC – Indicates that the accessibility of the associated entity is unlimited

• PROTECTED – Indicates that the accessibility is limited to derived components and entities that are in the same path

• PATH – Indicates that the accessibility is limited to entities that are in the same path

• PRIVATE – Indicates that the accessibility is limited to the declaring component

version Attribute Type

Attributes of type version match the following pattern:

[0-9]+\.[0-9]+

schemaVersion Attribute Type

Attributes of type schemaVersion can have only one value, 5.0.