7.1 Introduction

7.1.1 Topics

Table 7.1 lists the topics for this clause.

7.1.2 Objectives

This clause addresses conformance of X3D UTF-8 encoded files and conformance of X3D generators and X3D browsers that support the X3D UTF-8 encoding.

The primary objectives of the specifications in this clause are:

1. to promote interoperability by eliminating arbitrary subsets of, or extensions to, ISO/IEC 19775;
2. to promote uniformity in the development of conformance tests;
3. to promote consistent results across X3D browsers;
4. to facilitate automated test generation.

7.1.3 Scope

Conformance is defined for X3D UTF-8 encoded files and for X3D browsers which support UTF-8 encoded files. For X3D generators, conformance guidelines are presented for enhancing the likelihood of successful interoperability.

A concept of conformance to a X3D profile is introduced along with the rules which apply to this encoding.

This clause addresses the X3D data stream and implementation requirements. Implementation requirements include the latitude allowed for X3D generators and X3D browsers. This clause does not directly address the environmental, performance, or resource requirements of the generator or browser.

This clause does not define the application requirements or dictate application functional content within a X3D file.

The scope of this clause is limited to rules for the open interchange of X3D content using the UTF-8 encoding.

7.2 Conformance

7.2.1 Conformance of X3D UTF-8 encoded files

A X3D file is syntactically correct according to ISO/IEC 19775 if the following conditions are met:

1. The X3D file contains as its first element a X3D header comment (see 4.2.2, Header).
2. All entities contained therein match the functional specification of the corresponding entities of ISO/IEC 19775. The X3D file shall obey the relationships defined in the formal grammar and all other syntactic requirements.
3. The sequence of entities in the X3D UTF-8 encoded file obeys the relationships specified in ISO/IEC 19775 producing the structure specified in ISO/IEC 19775.
4. All field values in the X3D UTF-8 encoded file obey the relationships specified in ISO/IEC 19775 producing the structure specified in ISO/IEC 19775.
5. No nodes appear in the X3D file other than those allowed by ISO/IEC 14772 unless required for the encoding technique or those defined by the PROTO or EXTERNPROTO entities.
6. The X3D file is encoded according to the rules of ISO/IEC 19775.
7. It does not contain behaviour described as undefined elsewhere in this specification.

A X3D UTF-8 encoded file conforms to the Core profile if:

8. It is syntactically correct.
9. It meets the restrictions of the Core profile as specified in ISO/IEC 19775-1.

A X3D UTF-8 encoded file conforms to the Interchange profile if:

10. It is syntactically correct.
11. It meets the restrictions of the Interchange profile as specified in ISO/IEC 19775-1.

A X3D UTF-8 encoded file conforms to the Interactive profile if:

12. It is syntactically correct.
13. It meets the restrictions of the Interactive profile as specified in ISO/IEC 19775-1.

A X3D UTF-8 encoded file conforms to the Immersive profile if:

14. It is syntactically correct.
15. It meets the restrictions of the Immersive profile as specified in ISO/IEC 19775-1.

A X3D UTF-8 encoded file conforms to the Full profile if:

16. It is syntactically correct.
17. It meets the restrictions of the Full profile as specified in ISO/IEC 19775-1.

A X3D UTF-8 encoded file conforms to other profiles if:

18. It is syntactically correct.
19. It meets the restrictions of the profile as defined in the specification for that profile.

7.2.2 Conformance of X3D UTF-8 encoding generators

A X3D UTF-8 encoding generator conforms to this part of ISO/IEC 19775 if all X3D files that are generated are syntactically correct.

A X3D UTF-8 encoding generator conforms to a particular profile if it can be configured such that all X3D files generated conform to that particular profile.

7.2.3 Conformance of X3D UTF-8 encoding browsers

A X3D browser that supports the UTF-8 encoding conforms to a particular profile if:

1. It is able to read any X3D UTF-8 encoded file that conforms to that particular profile.
2. It presents the graphical and audio characteristics of the X3D nodes in any X3D UTF-8 encoded file that conforms to the that particular profile, within the latitude defined the specification for that particular profile.
3. It correctly handles user interaction and generation of events as specified in ISO/IEC 19775-1, within the latitude defined in the specification for that particular profile.
4. It satisfies the requirements of that particular profile in regard to minimum support requirements as defined in the specification for that particular profile.
5. It satisfies the general conformance requirements for browsers as stated in ISO/IEC 19775-1--7. Conformance.