June 30, 2019

1. Introduction: IVOA Interoperability Meeting

The International Virtual Observatory Alliance (IVOA) interoperability meeting held in Paris, France 12-17 May 2019 was a formal milestone (MS20 - Progress and priorities at IVOA(1)) for the ESCAPE Work package Connecting ESFRI projects to EOSC through VO Framework (CEVO). It was the first IVOA meeting during the ESCAPE project, and overall it served as an important first milestone for the CEVO Work Package.
In these milestone reports, we will report on the progress of the CEVO Work Package activities that have been presented at the IVOA meeting, and on the discussions held at IVOA on the priorities for the development of standards relevant to the ESFRI projects and other research infrastructures participating in CEVO.  We will track the participation of ESCAPE partners in IVOA meetings, and also the wider European contributions to IVOA. The means of verification for these milestones are the IVOA meeting website and the ESCAPE participation in the meeting, a record of these will be included in the milestone reports. In this first Milestone report, we also provide some background information about the IVOA and the role of the interoperability meetings. 

The vision of the Virtual Observatory (VO) is a collection of interoperating data archives, services and software tools that facilitate astronomical research. The IVOA is the organisation that debates and agrees on the technical standards that are needed to make the VO possible. A recent paper on the status of the IVOA in 2018 is available (Allen et al. 2019, arXiv 1903.06636), and information about IVOA for Astronomers, Deployers and Members can be obtained at http://ivoa.net. IVOA meets twice per year for Interoperability Meetings, which are working meetings of the IVOA Working Groups (WG) and Interest Groups (IG). The IVOA Executive Committee, made up of national representatives of IVOA member projects provides the overall guidance of the IVOA, with a Technical Coordination Group (TCG) made up of the Chairs of the 6 WG and 7 IGs that provides the technical roadmap, and the Standing Committee for Science Priorities (CSP) that provides input on scientific directions. The processes for developing and approving IVOA standards are maintained by a Standing Committee for Standards and Processes. There is also an IVOA Media Group.

The Paris Interoperability meeting gathered 131 participants for a 5-day meeting. The meeting web pages, including the detailed schedule of the meeting and the list of participants is available at the links in the table below.

Meeting Page for IVOA Paris 2019    https://indico.obspm.fr/event/64/overview

Detailed Schedule Page    https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2019

List of Participants    https://indico.obspm.fr/event/64/registrations/participants

Social Media     Hash-tag : #ivoa19fr, Twitter : https://twitter.com/IVOAastro

2. ESCAPE CEVO and European participation

European participation in this meeting was strong, and there was a very good level of representation of the ESCAPE CEVO partners who provided good visibility of the ESCAPE project even in this early “ramp-up” phase of the project. The list of European contributions, with a link to the slides presented, is tabulated in Appendix A of this report, with the ESCAPE CEVO contributions indicated.   
Significant contributions were made to the overall motivation and organisation of the meeting by members of ESCAPE CEVO. The lead of the CEVO work package (M. Allen, CNRS-ObAS) is currently the Chair of the Executive Board of the IVOA, which enabled information about ESCAPE to be presented to the IVOA Executive Board meeting, and this has been included in the report of the European Virtual Observatory (Euro-VO) to IVOA alongside of the reports of all the IVOA member projects. The other IVOA Executive Board members from ESCAPE CEVO partners are F. Genova (CNRS-ObAS, OV-France), A. Lawrence (UEDIN, UK VO Project), F. Pasian (INAF, VObs.it), E. Solano (INTA, SVO) and J. Wambsganss (UHEI, GAVO). 

In IVOA Interoperability meetings the WG and IG Chairs are responsible for building the program and for guiding the discussions on the development, use and feedback on IVOA interoperability standards. A number of the IVOA WG and IG Chairs come from ESCAPE CEVO partners, namely M. Molinaro (INAF) is Chair of the Data Access Layer WG, A. Nebot (CNRS-ObAS) is Chair of the Time Domain IG and D. Morris (UEDIN) is the Vice Chair, M. Louys (CNRS-ObAS) is the outgoing Chair of the Semantics WG and M. Demleitner (UHEI) is the incoming Chair of this IG, G. Taffoni (INAF) is the new Chair of the Grid and Web services WG, Carlos Rodrigo (INTA) is the Chair of the of the Theory IG,  A. Schaaff (CNRS-ObAS) is the Chair of the Data Curation and Preservation IG, and K. Polsterer (HITS, WP3-WP4 interface) is the Chair of the Knowledge Discovery IG. With this high level of representation in the IVOA Exec and WG/IG leadership roles, ESCAPE CEVO partners have contributed significantly to the overall organisation and direction of this interoperability meeting.

All of the ESCAPE CEVO partners were encouraged to participate in this first IVOA meeting. All of the above Euro-VO partners have participated. Representatives from the ESCAPE partners who are connected to the ESFRI and other research infrastructures, who participated in this meeting include V. Delouille (ROB) for the European Solar Telescope (EST), C. Boisson and M. Servillat (ObsParis) for the Cherenkov Telescope Array (CTA), and A. Micol (ESO). The ESCAPE SKAO partner contributed to a general SKA presentation (S. Gaudet, Canada, and R. Bolton, SKAO). The ESCAPE CEVO partners also facilitated the participation of a representative from EUDAT (C. Martens, DKRZ) to enable liaison with EOSC. Note that the LSST project was represented by members of the US LSST project.

3. State of the IVOA and Scientific Priorities

The opening plenary address on the “State of the IVOA” (M. Allen, CNRS-ObAS) highlighted how the development of the VO is recognised as a pioneering effort for FAIR data sharing, and how the long term investment in IVOA has led to it being an operational framework for interoperable access to astronomy data and services across all areas of astronomy. The mapping of the FAIR principles onto the IVOA architecture was shown, and the concepts of Open Science and Data Stewardship were emphasised. Reference was also made to the previous IVOA meeting in November 2018, College Park, USA, (before the beginning of the ESCAPE project) where the “State of the IVOA” presentation there had  included an outline of a number of important policy developments in Europe with respect to the ESFRI Roadmap and Open Science initiatives (in particular EOSC) and the role that ASTERICS has played in the European and international contexts, and the transition of ASTERICS DADI activities to the new ESCAPE project.
The “State of the IVOA” presentation reported on the status of various VO projects from around the world with information provided by those IVOA member projects. The ESCAPE project was introduced in the Euro-VO report, and it was shown that ESCAPE CEVO includes many aspects which build on the results of the DADI work package of the previous ASTERICS project, and indeed the long timeline of Euro-VO projects back to 2001. The overall approach of the ESCAPE project was described as a cluster of astronomy, astroparticle and accelerator particle physics infrastructures, with the binding theme of enabling multi-messenger physics, and helping to build the EOSC. The ESCAPE goals were presented with an emphasis on the work of CEVO and showing how the approach developed in ASTERICS is now extended to include EST as a partner. The description of ESCAPE also pointed out the goals of WP5 for science analysis platforms.

The plenary presentation by the IVOA Committee for Science Priorities (CSP) was made by B. Merin (ESA) with input from the committee including M. Allen (CNRS-ObAS). The CSP has the role of proposing the main scientific priorities to be pursued in IVOA, which are then approved via the IVOA Executive Board. The active scientific priorities are “Multi-dimensional Data” and “Time Domain Astronomy”. The future evolution of these priorities is being driven by the IVOA members, and to a large extent by the input from projects that will produce large amounts of data. The presentation outlined the process being taken at this interoperability meeting with the “Focus Session on Big Data Challenges”, and also the planned discussions of the CSP during the Interoperability meeting. As will be shown below, the ESCAPE CEVO participation in these sessions and discussions have been important for making progress toward the CEVO goals at IVOA, in particular to ensure that the requirements of the ESFRI and research infrastructures is taken into account at the IVOA level.

The “Focus Session on Big Data Challenges” sought to highlight the needs for the interoperability of large data sets from current and future projects. Presentations were made about the “LSST data exploitation plans” by the LSST project. A representative from the US MAST (Milkulski Archive for Space Telescopes at STScI) presented the needs of PanSTARRS, WFIRST and TESS data exploitation plans. Presentations from ESA showed the data exploitation plans for the Gaia and Euclid missions. A presentation about the SKA regional data centres was made by S. Gaudet (CADC, Canada) in coordination with the ESCAPE CEVO representative for SKAO, R. Bolton. The results of the focus session continue to be analysed, but the initial conclusions highlighted a number of directions for IVOA, in particular the extension of multi-d standards for cut-outs and rebinning of large data cubes, and standards that will be necessary for bringing the code ”close to the data”, and interoperable notebooks/platforms. The SKA presentation indicated that the primary interface for SKA data access and analysis is “required to be VO-compliant”. It is also notable that the LSST report to IVOA indicated that the LSST project is taking a “VO-first” approach to providing LSST data access web services, and the LSST presentation in the focus session highlighted the VO integration aspects for their science platform (portal/notebooks).

Being held in France, this interoperability meeting had a special significance for the French VO project (OV-France), and a plenary presentation on the development of the French contributions was made by F. Genova (CNRS-ObAS). 

4. Highlights of ESCAPE ESFRI and Research Infrastructure participation

A very important part of the IVOA interoperability meeting was the participation of the ESCAPE CEVO partner connected to EST. It brought in the aspects of ground based solar physics to IVOA, and it enabled significant progress to be made in terms of identifying the elements of the VO that are relevant for solar physics and for this activity to be integrated into the work of the IVOA Solar System IG. The presentation by V. Delouille (ROB) on “Sharing Solar data with ESCAPE and SOLARNET” included an overview of the current status of sharing space- and ground-based solar observation data, and the various levels of standardisation and usage of the Solar Virtual Observatory. The results of the preliminary ESCAPE CEVO discussions (between ROB and other CEVO partners) were apparent as there is already a first set of relevant IVOA standards that have been identified, namely TAP (and its customisation EPN-TAP as an access protocol), also SAMP for tool interoperability, UCDs for semantics with new requirements for use of UCDs in VOEvents. 

A significant effort was made at the interoperability meeting to finalise the work on the Provenance Data Model which was strongly supported by the ASTERICS DADI work, in particular with CTA as a major proponent of this standard.  An excellent overview of the standard was provided by M. Servillat (ObsParis) including the various reference implementations. This work is included in the transition from ASTERICS DADI to ESCAPE CEVO. M. Sanguillon (and ESCAPE CEVO ObsParis partner representatives) provided a presentation on the specific implementation in the CTA pipeline. The standardisation of the Provenance Data Model was subject to intense discussion (including ESCAPE CEVO partners) at this meeting in order to overcome the final hurdles to it becoming an IVOA proposed recommendation. These discussions came to a conclusion with the final version to be made available for review in the coming month.  

5. Highlights from the IVOA Working- and Interest Groups relevant to ESCAPE CEVO

Applications WG
The Applications WG had two main sessions on “Tools and Discovery” and on the “Hierarchical Progressive Surveys (HiPS)”, and a number of joint sessions with other WGs/IGs.
HiPS is a topic that underwent very strong development with the support of ASTERICS DADI, including the achievement of the HiPS standard, and strong global implementation of the standard and systems. This all-sky approach to data access and visualisation has gained wide interest of the ESCAPE CEVO partners and is expected to continue to increase in relevance and capabilities. Having a full session dedicated to this topic indicates its importance. International implementation of the system was reported by Chinese and US IVOA partners including for the Chandra X-ray Center, and the NASA IPAC data centre. The CEVO CNRS-ObAS partner presented HiPS/MOC integration in astropy packages (Baumann, CNRS-ObAS), and also the application of HiPS to density maps of catalogues as is needed for managing very large (multi-billion source) catalogues.

The “Tools and Discovery” Applications session presentations are particularly interesting for the future ESCAPE CEVO scientific training events, which plan to include the most up-to-date tools and services in the hands-on tutorials. In this session the latest capabilities of the TOPCAT application were presented (M. Taylor, Bristol). The most recent release of the ESASky application was shown (F. Giordano) including its use in notebooks, which along with the base visualisation component provided by CDS (Aladin Lite, and its notebook widget ipyaladin) demonstrates how these tools may be used in future science platforms. A complex integrated use of VO tools was also presented by P. Skoda (Czech Republic). The VO activities at the Italian space agency Space Science Data Centre (SSDC, previously named ASDC) were presented, highlighting various SAMP implementations for interoperability between services and tools.

Joint Time Domain IG – Applications WG 
The joint Applications WG and Time Domain IG session was dominated by ESCAPE CEVO partner contributions. The status of the standards for Time Series was presented by A. Nebot (CNRS-ObAS) and the use of time metadata in VOTable was presented (M. Demleitner, UHEI) followed by a practical demonstration of its implementation in the SPLAT-VO tool (M. Castro Neves, UHEI). D. Morris (UEDIN) provided a presentation on “Describing and discovering VOEvent services and streams”. A new extension of the MOC concept “Space-Time-MOC - Where and when in a few milliseconds” was presented by P. Fernique (CNRS-ObAS). This new extension allows indexing of sky based data in both its spatial sky coverage and also its coverage in time, and the practical demonstration gained significant attention. The further extension of the indexing to other dimensions (energy, redshift etc.) was also discussed as further possible steps. 

Various presentations were made in Applications WG and Operations IG sessions related to the implementation of standards, that are of high relevance to the ESCAPE CEVO activity for hands-on workshop for data providers. One of these presentations, on “A search engine for the VO standards” (L. Michel, Strasbourg Observatory) provides a system that improves the usability of the IVOA documentation by helping data providers navigate the standards specification.
Registry WG
One of the main tasks of CEVO is the connection of the VO to the EOSC, with one of the initial goals of CEVO task 4.1 being the inclusion of the VO registry into the EOSC registries/catalogues. The first part of the work includes building up an understanding of the right approach for doing this. Using the already established connection to the EUDAT project (in particular for the B2FIND registry), a contact from EUDAT was invited to attend the IVOA interoperability meeting. C. Martens (DKRZ) attended the meeting, and contributed to the various discussions in the Registry WG. She gave a presentation on “Mapping VOResource to oai_datacite: Why and How”. Discussions were held in the session and also in various side meetings which is helping to define how the VO registry will be updated in B2FIND. Communication on these topics is ongoing.

A number of other topics that were discussed in the Registry WG sessions are relevant to ESCAPE and to European VO activities. K. Vrioni (ESA) reported on the recent upgrade of the Euro-VO registry, and in particular the new portal which was released shortly after the meeting (http://registry.euro-vo.org). Another topic was the proposed enhancement of the registry system to facilitate the discovery of data collections by M. Demleitner (UHEI). Also, D. Morris (UEDIN) lead a discussion on the changes in the VO registry needed for supporting VOEvents.

Data Access Layer WG
The Data Access Layer WG was very active at the meeting with three full sessions, lead by M. Molinaro (INAF). The first session on “Standards: revisions and updates” included reports on the newly developing standards for coordination of multi-messenger follow-up observation campaigns, with the proposed standard for observatories to share information on the “visibility” of sky regions and a protocol to query such information. These are being developed as the ObsLocTAP and ObjVisSAP standards. An overview of these was provided by R. Saxton (ESA). This session also included a presentation on the future steps for the Simple Image Access (SIA) and Server-Side data Operations (SODA) standards with an update by F. Bonnarel (CNRS-ObAS) and a presentation by K. Lo (LSST-DM) on the plan for LSST to make integrated use this of this standard (and others) for generating image cutouts as part of their data management systems. 

The second DAL WG session focused in the use of authentication in TAP services, and clients, in particular TOPCAT as presented by M. Taylor (Bristol) which will be of relevance to the many Euro-VO tutorials that use this application. The third DAL WG session addressed the feedback on the implementations of the ADQL standard with presentations from M. Molinaro (INAF) on the “IA2 VO service/resource rebuild overview”, and G. Mantelet (CNRS-ObAS) on “Evolutions of TAP-Lib & Co.” the widely used library for implementing the TAP standard that is supported by the CDS. D. Morris (UEDIN) also led a discussion on the next version of the ADQL standard.

Data Model WG
The Data Model WG had three sessions at this meeting. The first session concentrated on the general status of the WG with current topics such as the CAOM (Common Archive Observation Model) (Dowler, CADC) developed initially by CADC and that is gaining widespread use, including interest from SKA, ESO and ESA. The large effort on the Coordinate/Transformation/Measurements data models (previously grouped as the Space-Time-Coordinates model) was discussed. Following a long period of development and re-organisation into three separate models, the development is on-track for some components to move into a “proposed recommendation” phase before the next interoperability meeting. The presentation from the WG chair (Cresitello-Dittmar, Harvard CfA) showed the status of all three components, all of which will be relevant to CEVO partners. 

The second Data Model WG session concentrated on the Provenance Data Model, with a number of presentations on the reference implementations of this standard. As mentioned above, much effort was put into obtaining the final convergence required for this model, and the operational reference implementations show that it is ready for approval. The model was summarised by M. Servillat (ObsParis), and the reference implementations were shown for CTA (M. Sanguillon, LUPM), MUSE (O. Stericher, AIP), APPLAUSE (A. Galkin, AIP) and the use of a TAP protocol for queries was shown by F. Bonnarel (CNRS-ObAS).

The third Data Model WG session discussed Catalogue/Source properties in the contecxt of data models. The presentations showed the use of data models for Gaia and Euclid missions (J. Salgado, ESA), Planetary sources (M. Molinaro, INAF), Chandra X-ray Observatory (F. Civano ,CXC Harvard), and the CDS services VizieR (G. Landais, CNRS-ObAS), X-Match (F.-X. Pineau, CNRS-ObAS)  and Aladin (P. Fernique, CNRS-ObAS). 

Grid and Web Services WG
The Grid and Web Services WG session focused on the hot topics of authorisation and authentication, and bringing the “code to the data”. It is clear that the work in this WG will be important for the various science platforms being designed in different projects. A presentation was made by S. O’Toole (Uni. Macquarie) on how to use access control with all of the VO protocols, using the example of the Australian All Sky Virtual Observatory (ASVO) responding to their user demand for Single Sign On (SSO) capabilities. Another presentation (B. Major, CADC) outlined group membership authorisation in the CADC systems and the current status of the Group Management System Working Draft which is intended to provide a standard IVOA way to share authorization information among resources. S. Bertocco (INAF) reported on the “Data exchange and computation between data centers using common A&A” with results from the AENEAS project on how this is being studied for SKA. The prototype A&A interface presented takes into account the AARC blue print for A&A that forms the basis for the EOSC federated authentication architecture. The prototype is an attempt to enable A&A for VO services to be interoperable with the EOSC platform. C. Banek (LSST) made a presentation on “Bring your service to the data with kubernetes”, bringing her industry experience into IVOA, and it is notable she will take on the role as Vice Chair of the GWS WG as part of an increasing engagement of LSST with the IVOA.

Semantics WG
The Semantics WG session included presentations on “The Unified Astronomy Thesaurus 3.0” (S. Derriere, CNRS-ObAS) and also an update on the effort to create an index of standardised descriptions and metadata about observatories, facilities and instruments (E. Perret, M. Louys, CNRS-ObAS). M. Demleitner (UHEI) also lead a discussion on the use of Vocabularies in the IVOA (which will be of relevance to EOSC vocabularies).

Operations IG
The Operations IG session was concentrated on the results of the various VO monitoring systems that independently check the compliance of VO services. These VO Weather Reports help identify differences in interpretation of the standards or common problems in implementations. The results from the European monitoring systems at ESA and at Paris Observatory were presented. Also, a review of the past 4 years of issues related to VO Operations was done by the outgoing Chair and new Chair of the IG, T. McGlynn (NASA HEASARC) and M. Taylor (Bristol) respectively.

Knowledge discovery IG
The Knowledge Discovery IG session was lead by K. Polsterer (HITS) who is one of the main connections between WP3 and WP4 in ESCAPE, with the link being made on the subject of machine learning applications. Indeed the session was entirely focused on machine learning topics. Firstly A. D’Isanto (HITS) presented the initial results from the ESCAPE CEVO/WP3 activities which assessed the readiness of various aspects of the VO for machine learning, which highlighted a number of data access issues for downloaded large “full survey” data sets.

Theory IG
The Theory IG session covered the topics of “Semantics for Theory” (F. Le Petit, ObsParis) and also the implementation of IVOA theory standard SimDAL in the Pollux database of synthetic stellar spectra (O. Tortosa, LUPM) .

Solar System IG
The Solar System IG sessions covered a range of topics, including discussion of the EPN-TAP protocol which as mentioned above is directly relevant for the ESCAPE EST related activities. The “Sharing Solar data with ESCAPE” presentation by V. Delouille (ROB) and the Europlanet project talks by S. Erard and P. Le Sidaner (Obs Paris) showed many common challenges, and we identify the potential for Europlanet collaborations with ESCAPE CEVO on these topics, which should be pursued following the outcome of the current Europlanet H2020 proposal. Other topics in this session covered the interaction between IVOA and the IPDA.

Education IG 
This Interoperability meeting included sessions of the IVOA Education IG which covered topics that are of relevance for the preparation of training materials and CEVO plans for the “Science with Interoperable Data” schools. There was also a focus on the use of research data in planetariums, and various aspects of education, outreach and citizen science. The International Planetarium Society was represented by M. SubbaRao who presented on the topic of “Data To Dome”. 

Data Curation and Preservation IG
The DCP IG session was focused on the use of Digital Object Identifiers (DOIs). A. Schaaff (CNRS-ObAS) presented the status of the draft IVOA note on this topic, and various groups (CADC, Chandra X-ray Center, China-VO, ESA) presented their approach to DOIs. F. Genova (CNRS-ObAS) made a presentation on certification of “Trustworthy Data Repositories” by CoreTrustSeal (https://www.coretrustseal.org). Presentations were also made about recent discussions within the Research Data Alliance (RDA) by D. Schade (CADC) and C.M. Zwölf (Obs Paris), which are of relevance to the ESCAPE participation in RDA.

Astropy-VO hackathon/sprint
A special event was held at this Interoperability Meeting in connection with the Astropy Project (https://www.astropy.org). Astropy is a community effort to develop a common core package for astronomy in the Python language, and to foster an ecosystem of interoperable astronomy packages. A 2-day Astropy-VO Hacakthon/sprint was organised jointly by IVOA and Astropy with the goal of adding or enhancing VO tools within Astropy and supporting a higher level of interaction between IVOA and Astropy. During the event progress was made on establishing processes for coordinating the multiple global organisations who are contributing TAP (IVOA Table Access Protocol) clients to Astropy. Also consensus was reached on supporting PyVO (a Python API to the VO standards and protocols, an affiliated Astropy package), and identifying the need for dedicated maintainers with the next steps to be taken via the IVOA and Astropy developer’s mailing lists. Progress was also made on the compatibility of metadata between VOTables and astropy table objects.

The hackathon/sprint was an experimental aspect of this Interoperability meeting, where about 12 people were involved (including 2 participants from the ESCAPE partner CNRS-ObAS). We expect that these enhancements will bring benefits for the use of VO resources through various science analysis platforms that use python. As such these activities are of interest for CEVO and its connection with WP5 for access to VO data via the ESCAPE science platforms.

6. Conclusions and next steps

The IVOA interoperability meeting was a successful first milestone for CEVO. The ESCAPE project was very visible at this international interoperability meeting, and progress was made on establishing CEVO connections within IVOA so that the priorities of the ESFRI and other research infrastructures participating in CEVO can be represented at the IVOA. Many aspects of this initial work are being done as a natural transition of the results of the DADI work package of the previous ASTERICS project, but with important evolutions including the introduction of ground-based solar physics, and the strong emphasis on the scalability of the VO to large data sets. The initial priorities of CEVO are being established in the Work Plan (D4.1) and will be further developed in the first year of the ESCAPE project, but it is already obvious that there is a high level of coherence between the direction of the international IVOA and needs of the partners in CEVO. The next IVOA interoperability meeting will be held in Groningen, NL following the ADASS conference. This will serve as a focal point for the CEVO work package, and we plan for the ESFRI and research infrastructure partners to attend. We also note that the IVOA/ADASS events will include a number of strongly intersecting topics with other ESCAPE WPs so it could serve as an important ESCAPE event.

Appendix A. – Presentations 

The list below contains all the contributions at the IVOA interoperability meeting that are relevant to CEVO. Presentations made by members of CEVO partner institutes are indicated, and we also identify the European contributions. A link to the presentations files on the IVOA interoperability meeting web pages are provided for each contribution. Additionally a repository of the presentations has been created with the original presentation files (with the filenames prefixed with the presentation number in the table).

01. Opening Plenary Presentation: State of the IVOA
    M. Allen (CNRS-ObAS)

02. Committee for Science Priorities Status
B. Merin (ESA) and CSP [incl. M. Allen (CNRS-ObAS) - ESCAPE-CEVO]

03. Observatoires Virtuels France
F. Genova (CNRS-ObAS)

Focus Session on Big Data Challenges in Astronomy

04. LSST Data exploitation plans
T. Jenness (LSST)

05. PanSTARRS, WFIRST, TESS data exploitation plans
    T. Donaldson (MAST, STscI)

06. Gaia data explotation plans
J. González (ESA)
European contribution

07. Euclid data exploitation plans
J. Salgado (ESA)
European contribution

08. SKA Regional Centre data exploitation plans
S. Gaudet (CADC), R. Bolton (SKAO)

09. Open discussion on challenges and opportunities
B. Merin (ESA) and all
European contribution

Applications Sessions

10. CatTiler
T. Boch (CNRS-ObAS)

11. Recent and future Developments in MocPy
M. Baumann (CNRS-ObAS)

12. TOPCAT latest
M. Taylor (Bristol)
European contribution

13. A complex orchestration of VO tools in discovery of unknown sky objects
P. Skoda (Czech Republic)
European contribution

14. ESASky 3.1 and pyESASky (ESASky in your notebook)
F. Giordano (ESA)
European contribution

15. A search engine for the VO standards
    L. Michel (Obs. Strasbourg)
European contribution

16. VO Activities @ Space Science Data Center
F. Verrecchia (ASI-SSDS, INAF-OAR), C. Leto (ASI-SSDC), D. Navarra (SERCO)
European contribution

Time domain sessions

17. Time Series Status
A. Nebot (CNRS-ObAS)

18. VOTable1.4: TIMESYS and TOPOCENTER-derived reference positions
M. Demleitner (UHEI)

19. Aladin on time! Space-Time-MOC - Where and when in a few milliseconds
P. Fernique, D. Durand (CADC), A. Nebot, T. Boch, F.-X. Pineau (CNRS-ObAS)

20. Implementing Time Series in SPLAT
M. Castro Neves (UHEI)

21. Describing and discovering VOEvent services and streams
D. Morris (UEDIN, LSST:UK)

Registry WG sessions

22. Euro-VO Registry New Portal
K. Vrioni (ESA)
European contribution

23. Mapping VOResource to oai_datacite: Why and How
    C. Martens (DKRZ)

24. Discovering Data Collections
M. Demleitner (UHEI)

Data Access Layer WG sessions

25. Status of the Visibility Service and Observation Locator protocols
R. Saxton (ESA)
European contribution

26. Towards SIAP2-next and SODA next
F. Bonnarel (CNRS-ObAS)

27. SODA ImgServ for LSST in Python
    K. Lo (LSST-DM)

28. TAP 1.1 Authentication: Implementation in TOPCAT/STILTS 
M. Taylor (Bristol)
European contribution

29. IA2 VO service/resource rebuild overview
M. Molinaro, R. Butora, N. Calabria (INAF)
European contribution

30. Evolutions of TAP-lib & Co.
G. Mantelet (CNRS-ObAS)
European contribution

Data Model WG sessions

31. Data Models: Coords/Transformations/Measurements status
M. Cresitello-Dittmar (CfA, Harvard)

32. Data Models: Transformations
F. Bonnarel (CNRS-ObAS)

33. Spectral Line Data Model – SSLDM
N. Moreau (Obs Paris)
European contribution

34. Provenance Data Model Summary
M. Servillat (Obs Paris)

35. Provenance DM – MUSE Implementation
    O. Steicher (AIP)
European contribution

36. Provenance DM – APPLAUSE implementation
A. Galkin (AIP)
European contribution

37. Provenance via TAP
    F. Bonnarel (CNRS-ObAS)

38. Provenance DM – CTA pipeline
    M. Sanguillon
European contribution

39. Catalogue/Source properties
    J. Salgado (ESA)
European contribution

40. Planetary/extended sources
    M. Molinaro (INAF)

41. Chandra X-ray observatory sources
    F. Civano (CXC Harvard)

42. VizieR
    G. Landais (CNRS-ObAS)

43. Cross-Match (X-Match)
F.-X. Pineau (CNRS-ObAS)

44. Aladin
P. Fernique (CNRS-ObAS)

Grid and Web Services session
45. Implementing SSO with all the protocols
    S. O’Toole (ASVO, Uni Macquarie)

46. Group Membership Service Updates
B. Major (CADC)

47. Data exchange and computation between data centers using common A&A

    S. Bertocco, F. Tinarelli, G. Taffoni, C. Knapic (INAF)

48. Bring your service to the data with kubernetes
    C. Banek (LSST)

Semantics WG sessions

49. The Unified Astronomy Thesaurus 3.0
S. Derriere (CNRS-ObAS), K. Frey (Harvard)

50. Observatory, instrument/facilities index – update
E. Perret, M. Louys (CNRS-ObAS)
European contribution

Operations IG sessions

51. VO-Paris VO Weather Report
P. Le Sidaner, R. Savalle (ObsParis)
European contribution

52. ESA VO Weather Report
C. Arviset, C. Vrioni, J. Gonzales (ESA)
European contribution

53. Themes in VO Operations in the past 4 years
T. McGlynn (NASA HEASARC), M. Taylor (Bristol)
European contribution

Knowledge discovery sessions

54. Is VO ready for machine learning?
Link to presentation
A. D’Isanto (HITS)

Theory IG Sessions

55. Semantics for Theory
F. Le Petit (Obs Paris)
European contribution

56. SimDAL implementation for Pollux
O. Tortosa, M. Sanguillon, A. Palacios (LUPM)

Solar System IG sessions

57. VESPA: EPNCore and other topics
S. Erard (Obs Paris)
European contribution

58. A short guide for publishing planetary data in the VO
P. Le Sidaner (Obs Paris)
European contribution

59. Querying NASA/PDS with VESPA/EPNcore
P. Le Sidaner (Obs Paris)
European contribution

60. Sharing Solar data with ESCAPE
    V. Delouille (ROB)

Education IG sessions

61. ESASky Education Activities
D. Baines (ESA)
European contribution

62. PyVO: a hands on course
H. Heinl (Heidelberg)
European contribution

63. A tutorial involving Aladin data discovery
M. Demleitner (UHEI)

64. VR experience at INAF-OATS
    G. Iafrate (INAF)

65. Pro-Am project
E. Solano (INTA)

66. Usage of HiPS in outreach software
S. Derriere (CNRS-ObAS)

Data Curation and Preservation IG sessions

67. Trustworthy Data Repositories: CoreTrustSeal certification
F. Genova (CNRS-ObAS)

68. DOI Note status
A. Schaaff (CNRS-ObAS), T. Jenness (LSST)

69. Plans about DOIs in the ESA Science Archive
D. Baines (ESA)
European contribution

70. Discussion about RDA outputs relevant to DCP (Data versioning and data citation)
D. Schade (CADC)

71. Quick news about RDA Federation Identity Management recommendation
https://www.rd-alliance.org/sites/default/files/attachment/RDA Outputs_RDA Adoption Business Session_final-2.pptx 
C. M. Zwölf (Obs Paris)
European contribution

Closing Plenary Session

72. Technical Coordination Group closing remarks
P. Dowler (CADC), J. Evans (CXC Harvard)

73. Committee for Science Priorities closing remarks
B. Merin (ESA) 
European contribution

74. IVOA Executive closing remarks
M. Allen (CNRS-ObAS)