Election Markup Language
Election Markup Language (EML) is an XML-based standard to support end to end management of election processes.
History of EML
The OASIS Election and Voter Services Technical Committee, which met for the first time in May 2001, was chartered "To develop a standard for the structured interchange of data among hardware, software, and service providers who engage in any aspect of providing election or voter services to public or private organizations. The services performed for such elections include but are not limited to voter role/membership maintenance (new voter registration, membership and dues collection, change of address tracking, etc.), citizen/membership credentialing, redistricting, requests for absentee/expatriate ballots, election calendaring, logistics management (polling place management), election notification, ballot delivery and tabulation, election results reporting and demographics."
To help establish context for the specifics contained in the XML schemas that make up EML, the committee also developed a generic end-to-end election process model, initially based on work by election.com whose CTO chaired the first meetings. This model identifies the significant components and processes common to elections and election systems, and describes how EML can be used to standardize the information exchanged between those components.
The specification describes two complementary high-level process models of an election exercise, based on the human and technical views. The goal is to identify all the major steps involved in the process and the areas where data is to be exchanged or referenced. Then the messages and data formats detailed in the EML specifications themselves can be used to achieve the goals of open interoperability between system components around those processes.
Overview of EML
Voting is one of the foundations of democratic processes. In addition to providing for the orderly transfer of power, it also cements the citizen's trust and confidence in an organization or government when it operates efficiently. Access to standardized information in the voting process for voters as well as standardized data interchange can better facilitate verification and oversight for election procedures. Standards for clear, robust and precisely understood processes help promote confidence in the results. Election data interchange standardization fosters an open marketplace that stimulates cost effective delivery and adoption of new technology without obsolescing existing investments. However, traditional verification methods and oversight will continue to be vital, and in fact these things become more critical with the use of technology. A healthy democracy requires participation from citizens and continuous independent monitoring of processes, procedures and outcomes. The OASIS EML standard seeks to help facilitate transparency, access and involvement for citizens to the election process.
The primary function of an electronic voting system is to capture voter preferences reliably and securely and then report results accurately, while meeting legal requirements for privacy. The process of vote capture occurs between 'a voter' (individual person) and 'an e-voting system' (machine). It is critical that any election system be able to prove that a voter's choice is captured correctly and anonymously, and that the vote is not subject to tampering, manipulation or other sources of undue influence.
These universal democratic principles can be summarized as a list of fundamental requirements, or 'six commandments', for electronic voting systems:
- Keep each voter's choice an inviolable secret.
- Allow each eligible voter to vote only once, and only for those offices for which he/she is authorized to cast a vote.
- Do not permit tampering with the voting systems operations, nor allow voters to sell their votes.
- Report all votes accurately
- The voting system shall remain operable throughout each election.
- Keep an audit trail to detect any breach of  and  but without violating .
EML was developed following these guidelines.
Design of EML
The goal of the committee is to develop an Election Markup Language (EML) for end-to-end use within the election process. This is a set of data and message definitions described as a set of XML schemas and covering a wide range of transactions that occurs during various phases and stages of the life cycle of an election. To achieve this, the committee decided that it required a common terminology and definition of election processes that could be understood internationally. The committee therefore started by defining the generic election process models described here.
These processes are illustrative, covering the vast majority of election types and forming a basis for defining the Election Markup Language itself. EML has been designed such that elections that do not follow this process model should still be able to use EML as a basis for the exchange of election-related messages.
EML is focused on defining open, secure, standardised and interoperable interfaces between components of election systems and thereby providing transparent and secure interfaces between various parts of an election system. The scope of election security, integrity and audit included in these interface descriptions and the related discussions are intended to cover security issues pertinent only to the standardised interfaces and not to the internal or external security requirements of the various components of election systems.
The security requirement for the election system design, implementation or evaluation must be placed within the context of the vulnerabilities and threats analysis of a particular election scenario. As such the references to security within EML are not to be taken as comprehensive requirements for all election systems in all election scenarios, nor as recommendations of sufficiency of approach when addressing all the security aspects of election system design, implementation or evaluation. In fact, the data security mechanisms described in EML documentation are all optional, enabling compliance with EML without regard for system security at all. It is anticipated that implementers may develop a complementary document for a specific election scenario, which refines the security issues defined in this document and determines their specific strategy and approach by leveraging what EML provides.
EML is meant to assist and enable the election process and does not require any changes to traditional methods of conducting elections. The extensibility of EML makes it possible to adjust to various e-democracy processes without affecting the process. Conceptually EML simply enables the exchange of data between the various end-to-end election stages and processes in a standardized way.
The solution outlined in EML is non-proprietary and will work as a template for any election scenario using electronic systems for all or part of the process. The objective is to introduce a uniform and reliable way to allow election systems to interact with each other. The OASIS EML standard is intended to reinforce public confidence in the election process and to facilitate the job of democracy builders by introducing guidelines for the selection or evaluation of future election systems.
For more details on the EML approach see the formal OASIS standard specification.
Versions of EML
- EML v7.0 was adopted as an OASIS Committee Specification in October 2011 
- EML v6.0 was adopted as an OASIS Committee Specification in August 2010 
- EML 5.0 was adopted as an OASIS Standard in December 2007.
EML utilizes a number of existing standards:
- Extensible Markup Language (XML): EML templates are expressed in a standardized XML
- XML Schema: EML utilizes XSD Schema for defining the information structures supporting the election processes XML Schema.
- xNAL: eXtensible Name and Address (xNAL) Specifications and Description Document (v3.0) Customer Information Quality Technical Committee OASIS July 2009
- UK's APD: Address and Personal Details Fragment v1.1 Technology Policy Team, e-Government Unit, Cabinet Office UK, 1 March 2002
- XML-DSig: XML-Signature Syntax and Processing Donald Eastlake et al., World Wide Web Consortium, 10 June 2008
- VoiceXML: Voice Extensible Markup Language (VoiceXML) Version 2.0 Scott McGlashan et al. World Wide Web Consortium 16 March 2004
Ron Rivest, renowned computer scientist and member of the Technical Guidelines Development Committee of the US Election Assistance Commission was quoted as saying "EML is an example of the kind of consensus-based, publicly available common format that enables the exchange of electronic records between different components in election systems."
In 2011, IEEE standards committee P-1622 decided to base its upcoming US Common Data Format standard on EML version 6.0, and to work with OASIS on incorporating changes to address US use cases. They include allowing UOCAVA voters to download the correct blank ballot for their jurisdiction, and supporting coordinated statewide post-election tabulation audits.
- Charter of OASIS EML Work
- Government and ICT Standards: An Electronic Voting Case Study by Jason Kitcat in Info, Comm & Ethics in Society (2004) 2: 1
- OASIS EML v5.0 standard, Process and Data Requirements
- "Election Markup Language (EML) Specification Version 7.0". OASIS Committee. Retrieved 18 August 2013.
- EML v6.0 Committee Specification
- OASIS Standards and Other Approved Work (EML v5.0)
- Customer Information Quality Technical Committee
- UK's Address and Personal Details Schema and Documents
- XML-Signature Syntax and Processing
- Voice Extensible Markup Language (VoiceXML)
- "E-Vote: Election Markup Language 5.0 Approved as OASIS Standard". Government Technology. 2008-01-29. Retrieved 2008-02-28.
- "Media Feed System". Australian Electoral Commission. 2010-06-08. Retrieved 2010-08-20.
- [EML Brochure] OASIS EML document., white paper Brochure on EML and its Capabilities. Document link EML brochure.
- [Open Secure Voting] Webber et al., white paper White Paper on Open Secure Voting with EML. Document link EML white paper.
- [Trusted Logic Voting] Trusted Logic Voting with OASIS EML, David Webber, 2005.
- [EML Case Study - Results Reporting] White Paper to NIST on California use of EML. David Webber, 2009.
- OASIS Election Markup Language Technical Committee
- Cover Pages: Executive Overview of EML
- OASIS wiki resources site for EML