diff --git a/patacrep/content/__init__.py b/patacrep/content/__init__.py
index ab18de6b..237bbb55 100755
--- a/patacrep/content/__init__.py
+++ b/patacrep/content/__init__.py
@@ -68,7 +68,7 @@ import sys
 import jinja2
 import yaml
 
-from patacrep import files, utils
+from patacrep import files, Rx, utils
 from patacrep.errors import SBFileError, SharedError
 
 LOGGER = logging.getLogger(__name__)
@@ -223,37 +223,31 @@ def render(context, content):
 
     return rendered
 
-def build_plugin_schema(plugins):
-    """Builds the Rx schema for the ContentItem"""
-    plugin_schemas = {}
-    for keyword, parser in plugins.items():
-        subschema = getattr(parser, 'rxschema', '//any')
-        plugin_schemas[keyword] = yaml.load(subschema)
-    plugin_schema = [{
-        'type': '//rec',
-        'optional': plugin_schemas,
-    }]
-    song_schema = {
-        'type': '//str',
-    }
-    plugin_schema.append(song_schema)
-    return {
-        'type': '//any',
-        'of': plugin_schema,
-    }
+def validate_parser_argument(raw_schema):
+    """Check that the parser argument respects the schema
+
+    Will raise `SBFileError` if the schema is not respected.
+    """
+    rx_checker = Rx.Factory({"register_core_types": True})
+    schema = rx_checker.make_schema(yaml.load(raw_schema))
+
+    def wrap(parse):
+        """Wrap the parse function"""
+        def wrapped(keyword, argument, config):
+            """Check the argument schema before calling the plugin parser"""
+            try:
+                schema.validate(argument)
+            except Rx.SchemaMismatch as exception:
+                msg = 'Invalid `{}` syntax:\n---\n{}---\n{}'.format(
+                    keyword,
+                    yaml.dump({keyword: argument}, default_flow_style=False),
+                    str(exception)
+                )
+                raise SBFileError(msg)
+            return parse(keyword, argument=argument, config=config)
+        return wrapped
+    return wrap
 
-def validate_content(content, plugins):
-    """Validate the content against the Rx content schema"""
-    plugin_schema = build_plugin_schema(plugins)
-    content_schema = {
-        'type': '//any',
-        'of': [
-            plugin_schema,
-            {'type': '//arr', 'contents':plugin_schema},
-            #{'type': '//nil'},
-        ]
-    }
-    utils.validate_yaml_schema(content, content_schema)
 
 def process_content(content, config=None):
     """Process content, and return a list of ContentItem() objects.
@@ -269,19 +263,14 @@ def process_content(content, config=None):
     contentlist = ContentList()
     plugins = config.get('_content_plugins', {})
     if not content:
-        content = [{'song': ""}]
-    try:
-        validate_content(content, plugins)
-    except SBFileError as error:
-        contentlist.append_error(ContentError("Invalid content", str(error)))
-        return contentlist
+        content = [{'song': None}]
     for elem in content:
         if isinstance(elem, str):
             elem = {'song': [elem]}
         if isinstance(elem, dict):
             for keyword, argument in elem.items():
                 if keyword not in plugins:
-                    contentlist.append_error(ContentError(keyword, "Unknown content type."))
+                    contentlist.append_error(ContentError(keyword, "Unknown content keyword."))
                     continue
                 contentlist.extend(plugins[keyword](
                     keyword,
diff --git a/patacrep/content/cwd.py b/patacrep/content/cwd.py
index 9a1f2352..69ca3a16 100755
--- a/patacrep/content/cwd.py
+++ b/patacrep/content/cwd.py
@@ -1,9 +1,15 @@
 """Change base directory before importing songs."""
 
-from patacrep.content import process_content
+from patacrep.content import process_content, validate_parser_argument
 from patacrep.songs import DataSubpath
 
 #pylint: disable=unused-argument
+@validate_parser_argument("""
+type: //rec
+required:
+  path: //str
+  content: //any
+""")
 def parse(keyword, config, argument):
     """Return a list songs, whith a different base path.
 
@@ -33,11 +39,4 @@ def parse(keyword, config, argument):
     config['_songdir'] = old_songdir
     return processed_content
 
-parse.rxschema = """
-type: //rec
-required:
-  path: //str
-  content: //any
-"""
-
 CONTENT_PLUGINS = {'cwd': parse}
diff --git a/patacrep/content/include.py b/patacrep/content/include.py
index 03e9bd3b..b469d4d5 100644
--- a/patacrep/content/include.py
+++ b/patacrep/content/include.py
@@ -8,7 +8,7 @@ import json
 import os
 import logging
 
-from patacrep.content import process_content, ContentError, ContentList
+from patacrep.content import process_content, ContentError, ContentList, validate_parser_argument
 from patacrep import encoding, errors, files
 
 LOGGER = logging.getLogger(__name__)
@@ -28,6 +28,13 @@ def load_from_datadirs(path, datadirs):
         )
 
 #pylint: disable=unused-argument
+@validate_parser_argument("""
+type: //any
+of:
+  - type: //str
+  - type: //arr
+    contents: //str
+""")
 def parse(keyword, config, argument):
     """Include an external file content.
 
@@ -69,12 +76,4 @@ def parse(keyword, config, argument):
 
     return new_contentlist
 
-parse.rxschema = """
-type: //any
-of:
-  - type: //str
-  - type: //arr
-    contents: //str
-"""
-
 CONTENT_PLUGINS = {'include': parse}
diff --git a/patacrep/content/section.py b/patacrep/content/section.py
index 5adf72ed..316b0fa3 100755
--- a/patacrep/content/section.py
+++ b/patacrep/content/section.py
@@ -1,6 +1,6 @@
 """Allow LaTeX sections (starred or not) as content of a songbook."""
 
-from patacrep.content import ContentItem, ContentList
+from patacrep.content import ContentItem, ContentList, validate_parser_argument
 
 KEYWORDS = [
     "part",
@@ -29,6 +29,16 @@ class Section(ContentItem):
             return r'\{}[{}]{{{}}}'.format(self.keyword, self.short, self.name)
 
 #pylint: disable=unused-argument
+@validate_parser_argument("""
+type: //any
+of:
+  - type: //str
+  - type: //rec
+    required:
+      name: //str
+    optional:
+      short: //str
+""")
 def parse(keyword, argument, config):
     """Parse the section.
 
@@ -47,17 +57,6 @@ def parse(keyword, argument, config):
         argument = {'name': argument}
     return ContentList([Section(keyword, **argument)])
 
-parse.rxschema = """
-type: //any
-of:
-  - type: //str
-  - type: //rec
-    required:
-      name: //str
-    optional:
-      short: //str
-"""
-
 CONTENT_PLUGINS = dict([
     (word, parse)
     for word
diff --git a/patacrep/content/song.py b/patacrep/content/song.py
index 020690d1..18680442 100755
--- a/patacrep/content/song.py
+++ b/patacrep/content/song.py
@@ -7,7 +7,7 @@ import textwrap
 
 import jinja2
 
-from patacrep.content import process_content
+from patacrep.content import process_content, validate_parser_argument
 from patacrep.content import ContentError, ContentItem, ContentList
 from patacrep import files, errors
 
@@ -58,6 +58,14 @@ class SongRenderer(ContentItem):
         return self.song.fullpath < other.song.fullpath
 
 #pylint: disable=unused-argument
+@validate_parser_argument("""
+type: //any
+of:
+  - type: //nil
+  - type: //str
+  - type: //arr
+    contents: //str
+""")
 def parse(keyword, argument, config):
     """Parse data associated with keyword 'song'.
 
@@ -121,10 +129,6 @@ def parse(keyword, argument, config):
                 ))
     return sorted(songlist)
 
-parse.rxschema = """
-type: //str
-"""
-
 CONTENT_PLUGINS = {'song': parse}
 
 
diff --git a/patacrep/content/songsection.py b/patacrep/content/songsection.py
index a6ccb013..abc9d609 100755
--- a/patacrep/content/songsection.py
+++ b/patacrep/content/songsection.py
@@ -1,6 +1,6 @@
 """Allow 'songchapter' and 'songsection' as content of a songbook."""
 
-from patacrep.content import ContentItem, ContentList
+from patacrep.content import ContentItem, ContentList, validate_parser_argument
 
 KEYWORDS = [
     "songchapter",
@@ -20,6 +20,9 @@ class SongSection(ContentItem):
         return r'\{}{{{}}}'.format(self.keyword, self.name)
 
 #pylint: disable=unused-argument
+@validate_parser_argument("""
+//str
+""")
 def parse(keyword, argument, config):
     """Parse the songsection.
 
@@ -30,10 +33,6 @@ def parse(keyword, argument, config):
     """
     return ContentList([SongSection(keyword, argument)])
 
-parse.rxschema = """
-//str
-"""
-
 CONTENT_PLUGINS = dict([
     (keyword, parse)
     for keyword
diff --git a/patacrep/content/sorted.py b/patacrep/content/sorted.py
index 32ef89af..277b722d 100755
--- a/patacrep/content/sorted.py
+++ b/patacrep/content/sorted.py
@@ -9,7 +9,7 @@ import unidecode
 
 from patacrep import files
 from patacrep.content import ContentError, EmptyContentList
-from patacrep.content import process_content
+from patacrep.content import process_content, validate_parser_argument
 from patacrep.content.song import OnlySongsError
 
 LOGGER = logging.getLogger(__name__)
@@ -67,6 +67,20 @@ def key_generator(sort):
     return ordered_song_keys
 
 #pylint: disable=unused-argument
+@validate_parser_argument("""
+type: //any
+of:
+  - type: //nil
+  - type: //rec
+    optional:
+      key:
+        type: //any
+        of:
+          - //str
+          - type: //arr
+            contents: //str
+      content: //any
+""")
 def parse(keyword, config, argument):
     """Return a sorted list of songs.
 
@@ -94,19 +108,4 @@ def parse(keyword, config, argument):
             ))])
     return sorted(songlist, key=key_generator(sort))
 
-parse.rxschema = """
-type: //any
-of:
-  - type: //nil
-  - type: //rec
-    optional:
-      key:
-        type: //any
-        of:
-          - //str
-          - type: //arr
-            contents: //str
-      content: //any
-"""
-
 CONTENT_PLUGINS = {'sorted': parse}
diff --git a/patacrep/content/tex.py b/patacrep/content/tex.py
index 3e0bf2e9..406084a8 100755
--- a/patacrep/content/tex.py
+++ b/patacrep/content/tex.py
@@ -5,7 +5,7 @@ import logging
 import os
 
 from patacrep import files, errors
-from patacrep.content import ContentItem, ContentList, ContentError
+from patacrep.content import ContentItem, ContentList, ContentError, validate_parser_argument
 
 LOGGER = logging.getLogger(__name__)
 
@@ -22,6 +22,13 @@ class LaTeX(ContentItem):
             )))
 
 #pylint: disable=unused-argument
+@validate_parser_argument("""
+type: //any
+of:
+  - type: //arr
+    contents: //str
+  - type: //str
+""")
 def parse(keyword, argument, config):
     """Parse the tex files.
 
@@ -62,12 +69,4 @@ def parse(keyword, argument, config):
 
     return filelist
 
-parse.rxschema = """
-type: //any
-of:
-  - type: //arr
-    contents: //str
-  - type: //str
-"""
-
 CONTENT_PLUGINS = {'tex': parse}