Fixed SPARQL resolving results parsing using nt. XML datatype parsing was incorrect

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (388a8cb) 72.87% compared to head (d578f41) 72.87%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #340 +/- ## ======================================= Coverage 72.87% 72.87% ======================================= Files 90 90 Lines 5802 5802 ======================================= Hits 4228 4228 Misses 1574 1574 ``` | [Flag](https://app.codecov.io/gh/BlueBrain/nexus-forge/pull/340/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/BlueBrain/nexus-forge/pull/340/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | `72.87% <0.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/BlueBrain/nexus-forge/pull/340?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | Coverage Δ | | |---|---|---| | [kgforge/specializations/stores/bluebrain\_nexus.py](https://app.codecov.io/gh/BlueBrain/nexus-forge/pull/340?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain#diff-a2dmb3JnZS9zcGVjaWFsaXphdGlvbnMvc3RvcmVzL2JsdWVicmFpbl9uZXh1cy5weQ==) | `27.94% <0.00%> (ø)` | |

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