Remove unused file

1.1/lido-constraints.sch

-<?xml version="1.0" encoding="UTF-8"?>
-<sch:schema xmlns:sch="http://purl.oclc.org/dsdl/schematron"
-    xmlns:sqf="http://www.schematron-quickfix.com/validator/process">
-    <sch:ns uri="http://www.lido-schema.org" prefix="lido"/>
-
-    <sch:pattern>
-        <sch:title>Allow free text or LIDO's concept elements (mutually exclusive)</sch:title>
-        <sch:p>Some elements in LIDO v1.0 should be controlled in the future whereas they are free
-            text elements in LIDO v1.0. To ensure backwarts compatibility either a free text or a
-            controlled term should be provided in a mutually exclusive way.</sch:p>
-
-        <sch:rule context="lido:extentMaterialsTech">
-            <sch:assert
-                test="
-                    (lido:displayConcept or lido:conceptID or lido:term) and not(text()[not(normalize-space(.) = '')] or @xml:lang or @lido:encodinganalog or @lido:label)
-                    or
-                    (text()[normalize-space(.) != ''] and not(lido:displayConcept or lido:conceptID or lido:term))"
-                > Either a free text (incl. its attributes) OR a combination of
-                lido:displayConceptID, lido:conceptID and lido:term can be a child of
-                lido:extentMaterialsTech, but not both at the same time. </sch:assert>
-        </sch:rule>
-    </sch:pattern>
-</sch:schema>